Nature Made Multi for Her plus Omega-3s Review
Product Focus: Thyroid HealthAlso covers:HormonesImmune systemRanked among:MultivitaminsMultivitamins for women
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Tier 4 · Rank 4
Tier 4 · Emerging. A promising mechanism or animal data, with thin human evidence so far. Rank 4 within Tier 4 for Thyroid Health; 30 of 59 overall. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
15 /100
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
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Study, Trial or Testing Result Summary
Members Only156 human studies · 35 improved
3 of these 156 human studies gave the ingredient by drip, not by mouth.
156 human studies35 improved92 no effect726,413 people studied
Vitamin D is the only ingredient here at a studied dose, at two servings a day. A pooled analysis of 12 trials in Hashimoto's thyroiditis found it lowered thyroid antibodies and raised thyroid hormones [1]. Results are mixed: another analysis found vitamin D alone did not lower antibodies over six months [2], and a 3-year trial in Graves' disease found no benefit [3]. Vitamin A helped thyroid markers in trials at 25,000 units a day [4], but this product gives only 4000 units. Zinc is also far below the 30 milligrams studied [5], and vitamin C is far below the 500 milligrams studied, where a larger trial found no benefit over placebo [6]. Vitamin E alone did not change thyroid hormones in controlled trials [7]. Fish oil at 1000 milligrams did not change thyroid hormones [8], and this product has much less. Chromium picolinate reduced absorption of meds, so take them hours apart [9]. High-dose biotin can distort thyroid blood tests [10]. Animal and cell studies are never counted.
See all 156 studies →Hide the studies
- Across 64 studies of 28,597 people, those with an underactive thyroid had lower vitamin B12 levels than healthy people, but no difference was seen for overactive thyroid, autoimmune thyroid disease or mild underactive thyroid; this did not test supplements.Vitamin B12 levels in thyroid disorders: A systematic review and meta-analysis.
- A pooled analysis of 114 observational studies found lower zinc in thyroid cancer tissue, but it did not test zinc supplements and is about cancer rather than thyroid health.Serum and tissue zinc in epithelial malignancies: a meta-analysis.
- Across 28 observational studies of 5,492 adults, blood folate levels did not differ significantly between people with thyroid disorders and healthy people.Folate concentrations in thyroid disorders: a systematic review and meta-analysis.
- In a pooled analysis of 35 trials with 3,508 people with underactive thyroid, adding zinc, magnesium and vitamin A to a med raised free thyroxine compared with placebo, though exercise combined with a med did best for thyroid-stimulating hormone and quality of life.Additional treatment strategies for hypothyroidism: a network meta-analysis.
- Across 12 trials with 862 people with Hashimoto's thyroiditis, vitamin D lowered thyroid antibody levels and raised thyroid hormones (FT3, FT4) compared with placebo or no treatment, with larger effects after more than 12 weeks.Effects of vitamin D supplementation on autoantibodies and thyroid function in patients with Hashimoto's thyroiditis: A …
- In a network analysis of 10 studies in people with Hashimoto's thyroiditis, six months of vitamin D alone did not significantly lower thyroid antibodies, while selenium did.Effects of different supplements on Hashimoto's thyroiditis: a systematic review and network meta-analysis.
- A pooled analysis of 32 observational studies found people with underactive thyroid had lower blood zinc than healthy people, but it did not test zinc supplements.Trace Element Status and Hypothyroidism: A Systematic Review and Meta-analysis.
- A pooled analysis of 10 observational studies found blood zinc was not significantly lower in people with thyroid cancer than in healthy controls.Zinc Status and Occurrence of Thyroid Cancer: Systematic Review and Meta-Analysis.
- A review of 25 patients with cobalt poisoning from chrome-cobalt hip implants found thyroid symptoms in 48%, but this was driven by blood cobalt rather than blood chromium, and no chromium supplement was given.A Systematic Review of Systemic Cobaltism After Wear or Corrosion of Chrome-Cobalt Hip Implants.
- A review of 11 studies found conflicting results for vitamin A supplements and thyroid cancer risk, so the evidence was inconclusive.Vitamin and mineral supplements and thyroid cancer: a systematic review.
- A review of 57 studies on micronutrients and thyroid hormones found trials did not confirm links between selenium, zinc and iron and iodine status, and concluded more research is needed; vitamin A was not singled out with a clear result.Micronutrients, iodine status and concentrations of thyroid hormones: a systematic review.
- A review of 67 studies on environmental factors and autoimmune thyroid disease linked vitamin D deficiency to the relationship and suggested vitamin D might help, but it did not test supplementation directly.Epidemiological and experimental evidence of environmental factor-related autoimmune thyroid disease: A systematic revie…
- A review of 51 studies on women around conception found obesity linked to folate, vitamin B12 and thyroid hormone changes, but no folic acid was given and thyroid findings were not about supplementation.Periconceptional biomarkers for maternal obesity: a systematic review.
- A review of eight zinc supplementation studies and ten blood zinc studies found the evidence on whether zinc changes thyroid hormone levels inconclusive because results differed and came only from people with illness.Relation Between Zinc and Thyroid Hormones in Humans: a Systematic Review.
- A review of 13 trials in people with overweight or obesity found zinc raised free triiodothyronine, but this rested on one study in people with underactive thyroid and the overall effect on thyroid function could not be determined.The Effects of Zinc and Selenium Supplementation on Body Composition and Thyroid Function in Individuals with Overweight…
- A review of studies on trace elements and thyroid disease found few supplementation trials, but zinc supplementation lowered a marker of oxidative damage (malondialdehyde) in people with underactive thyroid.The Role of Selected Trace Elements in Oxidoreductive Homeostasis in Patients with Thyroid Diseases.
- A review of 23 studies on electronic waste exposure found thyroid function changes that were not consistent across studies, and it did not test chromium as a supplement for thyroid health.Health consequences of exposure to e-waste: a systematic review.
- In 25,871 older adults taking 2000 IU of vitamin D daily for a median of 5.3 years, autoimmune diseases (including autoimmune thyroid disease, not reported separately) were 22% less frequent than with placebo.Vitamin D and marine omega 3 fatty acid supplementation and incident autoimmune disease: VITAL randomized controlled tri…
- In 438 pregnant women in The Gambia, a multiple micronutrient supplement with 300 mcg iodine, compared with iron and folic acid alone, raised urinary iodine and lowered thyroglobulin, but thyroid hormone tests did not differ; folic acid was only in the comparison group, so this does not show a folic acid effect on thyroid health.Effects of an Iodine-Containing Prenatal Multiple Micronutrient on Maternal and Infant Iodine Status and Thyroid Functio…
- In 404 South African children aged 5 to 14 with low vitamin A and iodine, a 200,000 IU vitamin A dose given at the start and at 3 months over 6 months lowered thyroid-stimulating hormone, thyroglobulin and thyroid size when given without iodine, compared with placebo.Vitamin A supplementation in iodine-deficient African children decreases thyrotropin stimulation of the thyroid and redu…
- In 278 adults with Graves' disease taking 2800 IU of vitamin D daily for up to 3 years, vitamin D did not improve remission; failure was 42% with vitamin D versus 32% with placebo.Effect of Vitamin D Supplementation on Graves' Disease: The DAGMAR Trial.
- In 180 postmenopausal women (60 took omega-3), taking 1000 mg of omega-3 fish oil daily for 12 weeks did not change thyroid hormone levels compared with placebo, although it did reduce menopausal symptom scores.The comparison of the effect of soybean and fish oil on supplementation on menopausal symptoms in postmenopausal women: …
- In 164 people with cirrhosis given vitamin D for one year, thyroid-stimulating hormone and free T4 did not change compared with placebo, though vitamin D levels rose.Effect of Vitamin D Supplementation on Vitamin D Level and Bone Mineral Density in Patients With Cirrhosis: A Randomized…
- In 148 people having thyroid cancer surgery with neck dissection, calcium plus vitamin D cut symptomatic low calcium to 2.0% from 26.0% with no supplements.Prevention of postoperative hypocalcemia with routine oral calcium and vitamin D supplements in patients with differenti…
- In 140 older adults with sarcopenia, adding vitamin D to heat therapy and resistance exercise lowered inflammatory markers and raised thyroid hormone levels more than exercise and heat therapy alone.The effects of vitamin D combined with thermotherapy and resistance exercise on inflammatory factors, thyroid hormones a…
- In 138 Moroccan children with goiter and low vitamin A using iodized salt, 200,000 IU of vitamin A at start and 5 months over 10 months reduced thyroglobulin, thyroid-stimulating hormone and goiter rate compared with placebo.The effects of vitamin A deficiency and vitamin A supplementation on thyroid function in goitrous children.
- In 102 people with autoimmune thyroiditis, 500 mg of vitamin C daily for 3 months lowered thyroid antibody levels within the group, but there was no significant difference compared with placebo, and thyroid stimulating hormone did not change.Effects of selenium and vitamin C on the serum level of antithyroid peroxidase antibody in patients with autoimmune thyr…
- In 90 people with heart disease living at altitude, 6 months of selenium plus vitamin E (42 people) lowered raised thyroid hormone levels back to normal in about 74% of them, but vitamin E was not tested on its own, so its separate effect is unclear.[Influence of oral sodium selenite and vitamin E on thyroid hormones in patients with cardiovascular disease at altitude…
- In 89 people with thyroid cancer given radioactive iodine treatment, those taking vitamin E showed better left parotid gland excretion function a month later, though other salivary gland measures were unchanged or worse and the dose was not stated.Effect of vitamin E and supragingival scaling on salivary gland function in patients with differentiated thyroid cancer …
- In 88 healthy adults over 65, 4 months of vitamin E at 60, 200 or 800 IU a day did not change thyroid hormones or thyroid antibodies compared with placebo.Assessment of the safety of supplementation with different amounts of vitamin E in healthy older adults.
- In 86 adults with underactive thyroid, 25,000 IU vitamin A twice weekly with zinc and magnesium for 10 weeks raised free thyroxine and lowered an inflammation marker compared with placebo, with no change in thyroid-stimulating hormone.Randomized Study of the Effects of Zinc, Vitamin A, and Magnesium Co-supplementation on Thyroid Function, Oxidative Stre…
- In 84 women, 25,000 IU of vitamin A daily for 4 months lowered thyroid-stimulating hormone in both obese and non-obese women and raised T3, while total T4 fell.The effect of vitamin A supplementation on thyroid function in premenopausal women.
- In 82 people with thyroid cancer given radioactive iodine, vitamin E at 100 to 300 mg a day from 1 week before to 4 weeks after treatment protected the salivary glands better than no vitamin E; thyroid function itself was not measured.Radioprotective effect of vitamin E on salivary glands after radioiodine therapy for differentiated thyroid cancer: a ra…
- In 80 postmenopausal women with or without type 2 diabetes, 6 weeks of hormone therapy with vitamin C and E did not significantly change free thyroxine or triiodothyronine levels.Effects of hormone replacement therapy with vitamin C and E supplementation on plasma thyroid hormone levels in postmeno…
- In 75 adults with type 2 diabetes given 1000 IU of vitamin D daily in a yogurt drink for 12 weeks, thyroid antibodies and thyroid-stimulating hormone fell only when calcium was added, while vitamin D alone raised resting metabolic rate without changing thyroid measures.Daily intake of yogurt drink fortified either with vitamin D alone or in combination with added calcium causes a thyroid…
- In 69 thyroid cancer patients given radioactive iodine, vitamin E with vitamin C improved the function of one parotid salivary gland, with no placebo group and no thyroid outcomes; selenium groups showed more gland improvements.Effects of postoperative antioxidants on the salivary glands in patients with thyroid cancer undergoing radioactive iodi…
- In 68 overweight or obese women with underactive thyroid, 12 weeks of zinc alone or with selenium raised some thyroid hormones (free T3, and free T4 with lower TSH when combined with selenium), but there were no significant differences between groups for most measures.Effects of Zinc and Selenium Supplementation on Thyroid Function in Overweight and Obese Hypothyroid Female Patients: A …
- In 62 very low birth weight infants, adding trace elements to fortified human milk raised zinc intake, but zinc deficiency was rare and the abstract reports no thyroid result.Nutrition of very low birth weight infants fed human milk with or without supplemental trace elements: a randomized cont…
- In 60 newborns randomized to early or late cord clamping, folate was measured but not given as a supplement, so the study does not show an effect of folic acid on thyroid health.Effect of cord clamping time on neonatal vitamin B12, folate and urinary iodine concentration.
- In 57 people with Graves' disease on methimazole, an antioxidant mix with beta-carotene, vitamins C and E and selenium over 60 days helped them reach normal thyroid function faster than the drug alone.Supplementation with antioxidants in the treatment of Graves' disease; the effect on glutathione peroxidase activity and…
- In 55 people with Graves' disease taking methimazole, adding an antioxidant mix (vitamins C and E, beta-carotene and selenium) for 60 days helped them reach normal thyroid function faster than methimazole alone.The effect of antioxidant supplementation on superoxide dismutase activity, Cu and Zn levels, and total antioxidant stat…
- In 49 women with iron deficiency, 60 days of a multi-nutrient supplement containing vitamin E improved blood iron and ferritin; thyroid hormones were measured but no thyroid effect was reported.[Effect of treatment with a food supplement (containing: selected sea fish cartilage, vitamin C, vitamin E, folic acid, …
- In 44 women with mildly underactive thyroid, 50,000 IU of vitamin D weekly for 12 weeks lowered thyroid-stimulating hormone and total cholesterol compared with placebo, while other thyroid hormones did not differ.Effects of vitamin D supplementation on metabolic parameters, serum irisin and obesity values in women with subclinical …
- In 42 women with Hashimoto's thyroiditis, 50,000 IU of vitamin D weekly for 3 months reduced thyroglobulin antibody and thyroid-stimulating hormone versus baseline, but the drop in thyroid peroxidase antibody was not significant versus placebo and T3 and T4 did not change.Can Supplementation with Vitamin D Modify Thyroid Autoantibodies (Anti-TPO Ab, Anti-Tg Ab) and Thyroid Profile (T3, T4, …
- In 42 newly diagnosed Graves' disease patients, adding selenium and vitamin D to standard antithyroid medicine for about 270 days lowered thyroid hormone levels faster and improved quality of life compared with medicine alone.Add-On Effect of Selenium and Vitamin D Combined Supplementation in Early Control of Graves' Disease Hyperthyroidism Dur…
- In 40 people, a hydration drink that also contained vitamin C caused no meaningful change in safety or thyroid hormone measures compared with placebo over 4 weeks, though one thyroid hormone showed a statistically significant main effect.Randomized Trial to Assess the Safety and Tolerability of Daily Intake of an Allulose Amino Acid-Based Hydration Beverag…
- In women with Hashimoto's thyroiditis taking a med, weekly vitamin D (50,000 IU cholecalciferol) for 3 months raised vitamin D levels, and inflammatory markers fell in both the vitamin D and placebo groups, so the drop was not shown to be due to vitamin D.Read the study on PubMed (36243929) →
- In 40 children with autoimmune thyroid disease, 12 weeks of 25 mg daily elemental zinc did not change thyroid antibodies, thyroid tests or oxidative stress, but children given zinc needed no increase in a med dose, while the standard-therapy group did.Effect of daily zinc supplementation for 12 weeks on serum thyroid auto-antibody levels in children and adolescents with…
- In people with hyperthyroidism and high blood calcium, adding 800 to 1,200 IU daily of vitamin D3 to standard treatment lowered thyroid hormone and thyroid antibody levels more than the antithyroid drug methimazole alone.Prevalence of hyperthyroidism with hypercalcemia in Xindu district and the efficacy of vitamin D3 treatment in these pat…
- In 36 thyroid cancer patients given radioactive iodine, 800 IU a day of vitamin E from 1 week before to 4 weeks after treatment helped protect salivary gland function compared with placebo; thyroid function itself was not measured.Does vitamin E protect salivary glands from I-131 radiation damage in patients with thyroid cancer?
- In women with Hashimoto's thyroiditis, weekly vitamin D (50,000 IU cholecalciferol) for 3 months lowered the Th17/Tr1 immune cell ratio, but most other immune cell levels did not change compared with placebo.Effects of vitamin D supplements on frequency of CD4+ T-cell subsets in women with Hashimoto's thyroiditis: a double-bli…
- In 32 healthy older adults, 800 mg a day of vitamin E for 30 days did not change thyroid hormone levels compared with placebo.Assessment of the safety of high-dose, short-term supplementation with vitamin E in healthy older adults.
- In 31 severely injured patients, adding 150 mg of vitamin E and zinc to 500 mcg of selenium for 5 days gave no extra change in thyroid hormones beyond selenium alone.Influence of selenium supplements on the post-traumatic alterations of the thyroid axis: a placebo-controlled trial.
- In 28 overweight or obese adults on a calorie-restricted diet, 8 weeks of 25 mg daily zinc gluconate plus selenium did not change thyroid function compared with placebo.The Effects of Zinc and Selenium Co-Supplementation on Resting Metabolic Rate, Thyroid Function, Physical Fitness, and F…
- In 25 infants with congenital hypothyroidism, mild high blood calcium during thyroxine treatment was linked to vitamin D supplementation.Hypercalcemia in infants with congenital hypothyroidism and its relation to vitamin D and thyroid hormones.
- In 12 underactive thyroid patients needing high-dose a med, 1 g vitamin C daily for 16 weeks improved symptom scores and lowered thyroid stimulating hormone more than placebo after adjustment, but the very small size and baseline imbalances limit conclusions.Read the study on PubMed (41210509) →
- In a single-dose study of 12 healthy adults, a zinc-bound form of liothyronine (50 mcg) produced a lower but longer-lasting rise in blood T3 than standard liothyronine, with no tested health outcome.Extended Absorption of Liothyronine from Poly-Zinc-Liothyronine: Results from a Phase 1, Double-Blind, Randomized, and C…
- In seven competitive cyclists, 22 mg of zinc daily for 30 days did not change thyroid hormone levels, although insulin rose later on.Plasma zinc, copper, and serum thyroid hormones and insulin levels after zinc supplementation followed by placebo in com…
- In a placebo-controlled trial of schoolchildren in India, a daily micronutrient-fortified drink for 14 months significantly changed thyroid-stimulating hormone compared with placebo, alongside improvements in vitamin D and other nutrients; this was a multi-nutrient product, so the vitamin D effect cannot be isolated.Effect of micronutrient supplement on health and nutritional status of schoolchildren: biochemical status.
- In hypothyroid newborns, giving vitamin D during the first 3 months of thyroxine treatment raised the rate of high blood calcium to 70%, compared with 21% in those not given vitamin D.[Prophylaxis of vitamin D deficiency in hypothyroidism in the newborn infant].
- In people with newly diagnosed Graves' disease taking anti-meds, nine months of 2,800 IU daily vitamin D reduced muscle strength gains and quality-of-life improvement compared with placebo.Effects of Supplemental Vitamin D on Muscle Performance and Quality of Life in Graves' Disease: A Randomized Clinical Tr…
- In men with type 2 diabetes on a 5-week high-protein, low-carbohydrate diet, thyroid hormones and vitamin B12 levels were unchanged; vitamin B12 was not given as a supplement.The metabolic response to a high-protein, low-carbohydrate diet in men with type 2 diabetes mellitus.
- In 110 people with Down's syndrome given zinc for about a year, thyroxine was lower and thyroid-stimulating hormone higher than before treatment, so thyroid function did not improve.Thyroid function and plasma immunoglobulins in subjects with Down's syndrome (DS) during ontogenesis and zinc therapy.
- In 53 patients with mild underactive thyroid and 45 healthy people, vitamin C infused into the forearm artery normalized blood vessel dilation in patients but not in healthy people, suggesting oxidative stress from inflammation impairs vessel function; this was a short-term vessel test, not a supplement trial.Low-grade systemic inflammation causes endothelial dysfunction in patients with Hashimoto's thyroiditis.
- In 40 people with underactive thyroid and 26 controls, homocysteine was higher in underactive thyroid and was predicted by thyroid-stimulating hormone independent of vitamin B12; vitamin B12 was not given as a treatment.Homocysteine, hypothyroidism, and effect of thyroid hormone replacement.
- In 31 women with underactive thyroid and 30 healthy women, folate was higher in the untreated thyroid group and stayed unchanged after thyroid hormone treatment; folic acid was not given.Homocysteine, folate and cobalamin levels in hypothyroid women before and after treatment.
- In children with Down syndrome, zinc sulfate supplements restored plasma zinc, TSH and reverse T3 levels that had been abnormal, though the study duration was not stated.Modulation of the neuroendocrine system and immune functions by zinc supplementation in children with Down's syndrome.
- In 47 women with Hashimoto's thyroiditis and low vitamin D, 4000 IU daily for 6 months lowered thyroid antibody levels, with a larger drop in women also taking selenomethionine, and thyroid hormone levels did not change.Selenomethionine potentiates the impact of vitamin D on thyroid autoimmunity in euthyroid women with Hashimoto's thyroid…
- In 12 women with an underactive thyroid, a single 100,000 IU dose of vitamin D3 raised blood vitamin D less than in healthy women, and thyroid hormone replacement raised vitamin D levels; the study did not measure thyroid health improvement.Effect of vitamin D3 loading and thyroid hormone replacement therapy on the decreased serum 25-hydroxyvitamin D level in…
- In 34 women with Hashimoto's thyroiditis on a med and normal vitamin D, 2000 IU daily of vitamin D for 6 months reduced thyroid antibody levels compared with women not taking vitamin D.Read the study on PubMed (28073128) →
- In 32 patients on antiepileptic drugs with low thyroid hormone, 30 days of pyridoxine, riboflavin and folic acid lowered homocysteine but did not change thyroid test results.Thyroid function during B-vitamin supplementation of patients on antiepileptic drugs.
- In 19 healthy college students, 14 took 600 mg of natural vitamin E daily for 12 weeks and 5 took placebo, and thyroid function tests did not change.Effects of elevated d-alpha(RRR)-tocopherol dosage in man.
- Niacin at 2 mg was used only as a comparison dose against intravenous TRH in schizophrenic patients, so this study does not measure niacin's own effect on thyroid health.Behavioral and endocrine responses of schizophrenic patients to TRH (protirelin).
- In a small study of 11 iron-depleted women, ascorbic acid supplementation had no significant effect on their responses to cold exposure, which included changes in thyroid hormone levels.Thermogenesis and thermoregulatory function of iron-deficient women without anemia.
- In seven healthy adults, chromium picolinate taken with a single a med thyroid hormone dose significantly reduced how much of the hormone was absorbed over six hours, so people on meds should separate the two by several hours.Read the study on PubMed (17725434) →
- In healthy young and elderly people, 10 days of vitamin A (retinol, 50,000 IU a day) did not significantly change thyroid-stimulating hormone levels compared with placebo.Effects of vitamin A administration on serum thyrotropin concentrations in healthy human subjects.
- In Down syndrome children with low blood zinc, zinc sulfate supplementation for 6 months lowered TSH from about 4.0 to 2.6 mIU/mL, bringing it to levels similar to children with normal zinc.Zinc sulfate supplementation improves thyroid function in hypozincemic Down children.
- In 186 vitamin D deficient people with Hashimoto's thyroiditis on Crete, taking 1200 to 4000 IU of vitamin D3 daily for four months lowered anti-thyroid peroxidase antibodies by 20.3% in an uncontrolled study; the drops in thyroglobulin antibodies and TSH were not significant.Is vitamin D related to pathogenesis and treatment of Hashimoto's thyroiditis?
- In 34 older adults over 6 months, a fruit, vegetable and berry powder that raised blood vitamin C was well tolerated and caused no thyroid-related safety problems, though a marker of protein damage fell before adjustment for baseline differences.Effects of a Commercial Fruit, Vegetable and Berry Juice Powder Concentrate on Metabolic Safety and Cardiovascular Healt…
- In 31 patients with underactive thyroid and gastritis, 500 mg vitamin C taken with a med for 2 months lowered thyroid stimulating hormone in all patients, normalized it in 55%, and raised thyroid hormone levels.Read the study on PubMed (24601693) →
- In 10 sedentary young men, 4 weeks of oral zinc sulfate supplements prevented the drop in thyroid hormone levels that followed bicycle exercise, though zinc did not raise thyroid hormones at rest beyond the pre-supplement values.Effect of fatiguing bicycle exercise on thyroid hormone and testosterone levels in sedentary males supplemented with ora…
- In 9 people with an underactive thyroid, about 4 months of thyroxine replacement cleared fats from the blood faster after a meal containing vitamin A and lowered LDL cholesterol, though this study did not test vitamin A as a supplement.Thyroxine replacement therapy enhances clearance of chylomicron remnants in patients with hypothyroidism.
- In five people with high cholesterol taking about 2.6 grams of nicotinic acid daily for an average of 1.3 years, blood thyroid hormone levels dropped (total T4 by 21%, T3 by 13%) while they stayed in a normal thyroid state with no symptoms of an underactive thyroid.Nicotinic acid decreases serum thyroid hormone levels while maintaining a euthyroid state.
- In a non-randomized study of thyroid and parathyroid surgery patients with low vitamin D, weekly 50,000 IU vitamin D2 for 8 to 12 weeks raised vitamin D levels in most patients, but thyroid health itself was not measured.Vitamin D deficiency: a simple algorithm employing weekly administration of 50,000 IU of vitamin D.
- In a University of Southern California study, people who took colestipol combined with niacin for one year had lower total thyroxine and lower thyroxine-binding globulin levels, but they stayed essentially normal in thyroid function.Alterations in serum thyroid hormonal indices with colestipol-niacin therapy.
- In a large cohort of over 566,000 adults followed for years, dietary beta-carotene intake was not clearly associated with thyroid cancer risk.The association between selenium and other micronutrients and thyroid cancer incidence in the NIH-AARP Diet and Health S…
- In a large retrospective study of 26,379 births in Beijing, folic acid supplementation was not identified as a factor linked to babies being born large (macrosomia), while maternal hypothyroidism during pregnancy was one of the factors linked to it.A retrospective cohort study on the influencing factors for macrosomia in singleton pregnancies.
- In 8,828 pregnant women, adequate vitamin D in early pregnancy was linked to higher free thyroxine and free triiodothyronine, and sufficient first-trimester with deficient second-trimester vitamin D was linked to lower thyroid-stimulating hormone.Associations between Dynamic Vitamin D Level and Thyroid Function during Pregnancy.
- In a large US survey of about 6,950 adults, higher vitamin B6 intake from diet was linked to lower total thyroxine levels, with the link strongest in men, people aged 60 to 80, and those who were overweight.Relationship between vitamin B6 intake and thyroid function in US adults: NHANES 2007-2012 results.
- In a survey of 5,878 US adults, higher vitamin C intake was linked to lower total thyroxine levels, with curved patterns for other thyroid hormone measures, so the effect on thyroid function is unclear.Association between vitamin C intake and thyroid function among U.S. adults: a population-based study.
- In 5,230 health-check adults, people with Hashimoto's thyroiditis had lower vitamin D levels than those without it, and lower vitamin D went with higher TSH and lower thyroid hormone levels; this association does not show cause.Correlation Between Hashimoto's Thyroiditis-Related Thyroid Hormone Levels and 25-Hydroxyvitamin D.
- In a large US national survey of 2,732 adults, dietary vitamin C intake was not significantly associated with risk of Hashimoto's thyroiditis, though higher omega-3 fat intake was linked to lower risk.Investigating the associations between dietary nutrient intake and risk of Hashimoto's thyroiditis: a cross-sectional st…
- In a cross-sectional survey of 2037 US adults, lower dietary folate intake was linked to higher odds of autoimmune thyroiditis; the abstract did not report a separate finding for vitamin B12 intake.Lower dietary folate intake increases the risk of autoimmune thyroiditis.
- In 1,207 adults aged 45 and older in Ireland, hypothyroidism and vitamin B12 deficiency were both linked to large red blood cells, and vitamin B12 deficiency affected 2.7 percent.Haematinic deficiency and macrocytosis in middle-aged and older adults.
- Vitamin D deficiency was more common in people with Hashimoto's and non-autoimmune hypothyroidism than in healthy controls in a study of 1,138 people in Iran.Vitamin D deficiency in non-autoimmune hypothyroidism: a case-control study.
- In 933 German patients with autoimmune thyroiditis, those whose vitamin D rose to 75 nmol/l or above over about two years saw their thyroid antibody levels fall by 25%, compared with a 9% fall in patients whose vitamin D stayed low; this was not a randomized trial.Vitamin D Status and Thyroid Autoantibodies in Autoimmune Thyroiditis.
- Among 461 people with Hashimoto's thyroiditis and 176 healthy controls, vitamin D levels did not differ overall between the groups, though slightly lower levels were seen in people with overt hypothyroidism.Vitamin D and Hashimoto's Thyroiditis: Observations from CROHT Biobank.
- In 608 people newly diagnosed with papillary thyroid cancer, urinary zinc levels were not reported as linked to tumor aggressiveness; men had higher zinc than women.Associations between essential microelements exposure and the aggressive clinicopathologic characteristics of papillary …
- In a review of medical records of 560 adults, cancer survivors and people without cancer used fish oil supplements at similar rates; this study did not measure fish oil's effect on thyroid health.Comparison of Comorbid Conditions Between Cancer Survivors and Age-Matched Patients Without Cancer.
- In a cross-sectional study of 401 men, 301 infertile and 100 controls, infertile men had lower vitamin D levels, and men with azoospermia also had higher thyroid stimulating hormone than the other groups, suggesting abnormal thyroid function; no supplement was given.25-Hydroxy cholecalciferol, anti-Müllerian hormone, and thyroid profiles among infertile men.
- In a case-control study of 197 people with thyroid tumor or goiter and 197 matched healthy controls, higher chromium levels were linked to lower risk, but cadmium and mercury showed mixed effects on thyroid function.A case-control study on the association of mineral elements exposure and thyroid tumor and goiter.
- In 387 middle-aged and older adults, red blood cell zinc was only weakly and negatively related to total T4 thyroid hormone levels.Basal metabolic rate and thyroid hormones of late-middle-aged and older human subjects: the ZENITH study.
- In 300 euthyroid people, low vitamin D was associated with a higher chance of thyroid autoimmunity, though this was a cross-sectional association and not a supplementation test.Latent autoimmune thyroid disease.
- In 256 surgical patients, vitamin D levels and deficiency rates were similar whether or not they had lymphocytic (Hashimoto's) thyroiditis, so no link was found.Is Vitamin D Deficiency Associated with Chronic Lymphocytic Thyroiditis?
- Pregnant women with iodine insufficiency had lower alpha-tocopherol (vitamin E) levels than those with adequate iodine, with no change in thyroid stimulating hormone.Assessment of thyroid function, ioduria and oxidative stress in women in the first trimester of pregnancy.
- In 252 pregnant women with an underactive thyroid, having enough vitamin D during pregnancy was linked to better thyroid function up to a year after giving birth.Vitamin D categories and postpartum thyroid function in women with hypothyroidism.
- In a questionnaire survey of 232 Polish people with hypothyroidism, vitamin C was among the supplements commonly taken, but the survey did not measure whether it improved thyroid health.Dietary supplements in hypothyroidism.
- In 219 men, blood chromium was not linked to thyroid stimulating hormone levels, although it was positively linked to prolactin, while arsenic and lead and copper showed other thyroid-related patterns.Multiple metals predict prolactin and thyrotropin (TSH) levels in men.
- In 190 people, those with autoimmune thyroid disease had more vitamin D deficiency than healthy controls, and low levels were linked to thyroid antibodies and abnormal thyroid tests; this was a cross-sectional study and cannot show cause.Vitamin D and autoimmune thyroid diseases.
- Women with chronic hair shedding had vitamin D and thyroid test levels similar to healthy controls.A comprehensive investigation of biochemical status in patients with telogen effluvium: Analysis of Hb, ferritin, vitami…
- In a blood metabolite comparison of 80 people with papillary thyroid cancer and 80 healthy controls, alpha-tocotrienol (a form of vitamin E) was higher in the cancer group. This was an association only and did not involve vitamin E supplementation.Serum Metabolomics Study of Papillary Thyroid Carcinoma Based on HPLC-Q-TOF-MS/MS.
- In 78 people with subclinical hypothyroidism and 75 healthy controls in Iraq, vitamin D levels were not linked to thyroid peroxidase antibody levels or thyroid peroxidase gene variants. No supplement was given.Thyroid Peroxidase and its Gene Variants as Diagnostic Markers in Subclinical Hypothyroidism: Evidence from a Duhok Case…
- In 133 Spanish adolescent boys, higher urinary chromium was associated with lower thyroid-stimulating hormone levels, a association whose health meaning is unclear.Association of urinary metal concentrations with blood pressure and serum hormones in Spanish male adolescents.
- In a retrospective review of 130 people having thyroid surgery, serum zinc levels did not differ significantly between those with papillary thyroid cancer and those with benign disease; copper was higher in the cancer group.Copper as ancillary diagnostic tool in preoperative evaluation of possible papillary thyroid carcinoma in patients with …
- Women with Hashimoto's thyroiditis had vitamin D levels similar to healthy women, though vitamin D correlated with some metabolic measures.Assessment of Vitamin Concentrations in Patients with Hashimoto's Thyroiditis and Their Relationships with Thyroid Funct…
- In 110 people in Iran, blood chromium levels were higher in patients with thyroid disease, and chromium was linked to a higher risk of hypothyroidism, hyperthyroidism, and thyroid cancer in this observational study.Thyroid dysfunction: how concentration of toxic and essential elements contribute to risk of hypothyroidism, hyperthyroi…
- Serum vitamin E tracked with lipid peroxides, and both were lower in malnourished people and people with thyroid disorders than in healthy adults.Serum vitamin E and lipid peroxides in malnutrition, hyper and hypothyroidism.
- A dietary survey of 103 schoolchildren in Adygea found insufficient intake of iodine, zinc, vitamin A and beta-carotene, and the authors concluded that low vitamin A and zinc intake may contribute to iodine deficiency and thyroid problems, but no supplement was tested.[Assessment of the structure and quality of nutrition as a factor that influences thyroid functional activity].
- In a cross-sectional study of 92 women with Hashimoto's thyroiditis, higher dietary vitamin C intake was weakly linked to lower thyroid antibody levels (r = -0.22, p = 0.05), but this was one of several correlations and does not show cause and effect.Parallel investigation of oxidative stress and nutritional profile in women with Hashimoto's thyroiditis.
- In 90 patients with thyroid cancer, alpha-tocopherol (vitamin E) was one of several metabolites that distinguished those with lymph node spread from those without.Gut microbiota and metabolite profiles in thyroid cancer lymph node metastasis: a multi-omics analysis.
- In 34 people with phenylketonuria or milder high phenylalanine and 42 healthy controls, blood alpha-tocopherol (vitamin E) levels did not differ between groups, even though selenium was lower in the patients and thyroid hormone status was altered.Antioxidant and thyroid hormone status in selenium-deficient phenylketonuric and hyperphenylalaninemic patients.
- In 68 women with insulin-resistant polycystic ovary syndrome, myo-inositol with folic acid, a med, or both for 3 months improved several hormone and glucose measures, with no added benefit from combining them; thyroid results were not a reported outcome.Read the study on PubMed (38853482) →
- In 67 adults with an overactive or underactive thyroid, blood zinc levels showed no clear link to thyroid activity.Free amino acids, copper, iron and zinc composition in sera of patients with thyrometabolic diseases.
- In 31 children with congenital hypothyroidism on long-term thyroid hormone treatment, vitamin D levels were higher than in 29 healthy children, and bone breakdown was not increased.Congenital Hypothyroidism and Bone Remodeling Cycle.
- Vitamin D deficiency was common in both people with and without autoimmune thyroid disease, with no statistically significant difference between groups.Vitamin D deficiency in thyroid autoimmune diseases.
- In 20 people with an underactive thyroid, 20 with an overactive thyroid and 20 healthy controls, blood vitamin E was raised in the underactive group and returned to control levels after 2 months of treatment. Oxidative stress markers also fell with treatment in the overactive group. Vitamin E was not supplemented.The effect of hypothyroidism, hyperthyroidism, and their treatment on parameters of oxidative stress and antioxidant sta…
- In a case-control study of 30 pregnant women with low thyroid function matched to 30 controls, higher blood chromium was associated with a somewhat greater risk of gestational hypothyroidism, with an odds ratio of 1.11.Association of metal mixtures during the second trimester with gestational hypothyroidism and its mediation by metabolit…
- This observational study of 58 overweight or obese adults did not test vitamin E as a treatment; it only found that people with food addiction reported higher intake of gamma-tocopherol, a form of vitamin E, and had lower TSH, a thyroid hormone, than those without food addiction.Hormonal and dietary characteristics in obese human subjects with and without food addiction.
- In 54 rural Brazilian children exposed to pesticides and metals, higher blood chromium was linked to higher levels of the thyroid-stimulating hormone and lower free thyroxine, which points to poorer thyroid function.Exposure to environment chemicals and its possible role in endocrine disruption of children from a rural area.
- In a study of 50 people, serum zinc was lower in thyroid cancer patients than in controls both before and after surgery, while zinc was higher in thyroid tissue; this study did not give zinc and so does not show an effect of zinc on thyroid health.Changes in the Serum Levels of Trace Elements Before and After the Operation in Thyroid Cancer Patients.
- LDL vitamin E was lower in hypothyroid patients than in healthy controls, while LDL oxidation was higher in both hyperthyroid and hypothyroid patients.Effect of thyroid function on LDL oxidation.
- In a cross-sectional study of 46 papillary thyroid cancer patients, higher vitamin E intake was linked to a lower rate of lymph node spread, though this does not prove vitamin E causes the benefit.Histopathological prognosis of papillary thyroid carcinoma associated with nutritional status of vitamins A and E.
- In a retrospective review of 45 Chinese adults admitted with thyrotoxic periodic paralysis, about one quarter had normal red blood cell zinc levels; this was not a zinc supplement study.Thyrotoxic periodic paralysis in a Chinese population.
- In 20 people with overt hypothyroidism, serum vitamin E was higher than in controls and correlated with markers of oxidative stress.Association between thyroid hormones, lipids and oxidative stress biomarkers in overt hypothyroidism.
- In 28 adults taking 100 to 800 IU of vitamin E daily for about 3 years, blood tests of the thyroid gland showed no disturbance, though no placebo group was used.Megavitamin E supplementation in man.
- In 25 people with overactive or underactive thyroids, vitamin B12 malabsorption was found in only 2 underactive patients, and fat and sugar absorption problems were common.Malabsorption in thyroid dysfunctions.
- In a case series of 22 surgical patients with low vitamin C or thiamin and raised TSH, two patients died from scurvy, and no vitamin C treatment effect on thyroid function was studied.Hypothyroidism Complicated by Vitamin C and Thiamin Deficiency in Surgical Patients.
- In 20 adults with acquired hypothyroidism, vitamin D metabolites and calcium-phosphorus measures were normal, and bone changes were linked to slowed bone activity; no vitamin D was given.[Bone effects of hypothyroidism in adults. Apropos of 20 cases].
- In a small pilot of 20 people, those with head and neck tumors or thyroid disease had blood heavy metal and PCB levels at least twice the reference maximum, while healthy volunteers did not; chromium was not reported separately.The role of heavy metals and polychlorinated biphenyls (PCBs) in the oncogenesis of head and neck tumors and thyroid dis…
- Over about 96 days at sea in 17 crew members, blood alpha-tocopherol (vitamin E) stayed stable during the first phase of hard work and a high-fat diet, while TSH rose. Vitamin E was not supplemented.Metabolic adaptation in the crew of the Hesperides on their Antarctic journey.
- In patients with both diabetes and thyroid disorders, marked vitamin D3 deficiency was reported alongside disturbed blood sugar and mineral metabolism; the study does not give a clear sample size.[Mineral metabolism and metabolic markers in patients with concomitant endocrine disorders and vitamin D3 deficiency].
- Women with Hashimoto's thyroiditis had vitamin D levels similar to or higher than healthy controls, and no women with the condition were vitamin D deficient, so Hashimoto's was not linked to more deficiency.HASHIMOTO THYROIDITIS NOT ASSOCIATED WITH VITAMIN D DEFICIENCY.
- In people with type 2 diabetes, correcting vitamin D deficiency did not change thyrotropin (TSH) levels, which were only slightly higher in those with deficiency.Vitamin D and thyrotropin in type 2 diabetic patients.
- This study tested a zinc measurement kit and found red blood cell zinc was lower in Graves' disease than in silent thyroiditis, helping tell the two apart; it did not test any supplement.Measurement of red blood cell zinc concentration with Zn-test kit: discrimination between hyperthyroid Graves' disease a…
- In a 1977 study, people with overactive thyroid excreted more zinc in urine than healthy people, and the extra loss tracked with how severe the thyroid-driven metabolic response was; no supplement was tested.Zinc metabolism and thyroid status.
- Both too little and too much of trace elements, including chromium, were linked to goiter, and living in carbonate rock areas was associated with more thyroid disease.[Hair trace elements in patients with goiter].
- In 50 children with biotinidase deficiency taking 5 to 20 mg of biotin daily, high biotin levels distorted thyroid stimulating hormone and other hormone blood tests run on one Roche assay system, so these lab results can mislead diagnosis, while removing the biotin from the sample corrected the error.Serum biotin interference: A troublemaker in hormone immunoassays.
- In 49 people with an underactive thyroid, 1,25-hydroxyvitamin D3 did not change TSH in those not on meds, but significantly raised basal TSH in those taking a med.[TSH secretion stimulated by thyroliberin in patients with hypothyroidism receiving 1,25-hydroxyvitamin D3].
- In 40 thyroid cancer patients receiving radioiodine, taking 1000 mg of vitamin E with vitamin C and selenium for 21 days beforehand reduced the rise in a blood marker of lipid peroxidation, with an average increase of 56% versus 112% in the group without supplements.Radioiodine-induced oxidative stress in patients with differentiated thyroid carcinoma and effect of supplementation wit…
- A single 300 mg intravenous dose of pyridoxine in 8 healthy people did not significantly change thyroid-stimulating hormone levels.Effect of pyridoxine on human hypophyseal trophic hormone release: a possible stimulation of hypothalamic dopaminergic p…
- In 7 healthy women, long-term pyridoxine did not change basal thyroid-stimulating hormone levels, though prolactin levels dipped slightly without statistical significance.Effect of pyridoxine on plasma levels of HGH, PRL, and TSH in normal women.
- In 6 people with amenorrhea-galactorrhea, 600 mg daily of oral pyridoxine for 3 to 4 months did not change thyroid-stimulating hormone levels or its response to releasing hormone.The effects of pyridoxine on pituitary hormone secretion in amenorrhea-galactorrhea syndromes.
- A single 300 mg intravenous dose of pyridoxine lowered thyroid-stimulating hormone in 6 people with hypothyroidism, but their thyroid hormone levels did not change.Suppression of thyrotropin (TSH) and prolactin (PRL) release by pyridoxine in chronic primary hypothyroidism.
- Five infants aged 8 to 11 months developed yellow skin from eating large amounts of carotene-rich foods, and their thyroid function tests were normal; stopping those foods cleared the yellow color, and the authors described the condition as benign.Benign carotenemia in children.
- This study compared ways of adding lab tests, including vitamin D and thyroid hormone tests, to diagnose deficiency and thyroid disorders. It did not test any vitamin D supplement's effect on thyroid health.Reflex and reflective testing: efficiency and effectiveness of adding on laboratory tests.
- In a 1977 animal study in male albino rats, chromium added to food across a wide range of doses affected thyroid gland structure and function, and the lowest dose tested, about 3 micrograms per kilogram of body weight, was judged the most physiological.[Thyroid gland morphological and functional indices in the experimental action of chromium].
Review Totals and Summary
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Biohacker Summary
Members Only0 of 10 recommend it
0 of 10 biohackers on our panel recommend it
The statements here cover only smaller ingredients in this product, and none of the panel spoke about the main ingredient, so there is no group view on it. Vitamin D drew the most comment, with most of the panel recommending or using it, mainly for immune support, brain and muscle health, fertility, bone healing and general health. Doses ranged from 5000 IU taken in the morning by one person to 10,000 IU a day in winter from another, and a few suggested taking it with dietary fat and getting blood levels tested. Vitamin C was recommended by several people, often paired with collagen for skin and joints, and zinc was used or recommended for testosterone, sperm health, gut lining and immunity, with doses of 15 and 30 milligrams mentioned. One panelist warned that the standard daily intake for vitamin D is far too low, and nobody said they had stopped taking any of these.
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Dr. Eric Berg · Vitamin D · warns
- Dr. Berg warns that the recommended daily intake for vitamin D is based on a massive error and that the actual necessary amount is closer to 8,895 IU, with millions remaining deficient.
- Recommends getting vitamin D levels tested to ensure they are between 50 and 70, as vitamin D is intimately involved in regulating prostate size.
- Recommends ensuring sufficient zinc intake because the prostate needs enough zinc for the conversion from testosterone to DHT to be smooth and optimized.
- Recommends taking at least 10,000 IUs of vitamin D3 every single day in the winter, stating it is the most important vitamin to lower cancer risk.
- Recommends vitamin D to support the immune system, aiming for blood levels between 80 to 100 ng per ml.
- Mentions that lemon is loaded with vitamin C, and when combined with coffee, vitamin C significantly increases the bioavailability of antioxidants in the coffee.
- Recommends taking no less than 10,000 IU's of vitamin D3 for osteoporosis, alongside magnesium and K2.
- Recommends increasing vitamin D to restore balance and support healthy blood pressure.
- Dr. Berg states that Vitamin C helps fight biofilms and is essential for making collagen in gums, teeth, and capillaries.
- States that a lack of vitamin D can potentially cause achy bones or crashing mood.
- Recommends taking zinc carnosine for an ulcer or some type of gastric problem.
- Recommends Vitamin C as a cofactor, especially for collagen.
- Notes that low vitamin A can lead to dry eyes, dry mouth, and night vision issues.
- States that vitamin D is intimately involved in the immune system and recommends taking at least 10,000 IUs each day.
Dave Asprey · Vitamin D · uses
- Takes Vitamin DAKE from Suppgrade Labs.
- Suggests that vitamin D supports brain health, muscle function, and focus.
- Recommends taking vitamin C for better skin health.
- Host Dave Asprey explains why correcting a vitamin D deficiency still makes sense for male fertility, even though supplementation did not improve overall semen parameters in a randomized trial.
- States that currently, he is only taking vitamin C and vitamin D.
- States that currently, he is only taking vitamin C and vitamin D.
- Dave Asprey's kids get a little bit of vitamin E every day, which helps to stabilize the bad oils they get when eating at restaurants.
- Developed a nonnano zinc sunscreen over five years, stating her skin is probably better now than it's ever been.
- Recommends vitamin D, noting it's actually a hormone and that most people are deficient, even those who take it, because they don't take enough.
- States that most people on the spectrum are low in vitamin D and need more of it, mentioning his own product, Vitam DAKNE, which contains real vitamin A.
- Emphasizes the importance of having enough zinc before trying advanced longevity strategies like peptides.
- Recommends real vitamin A for people on the spectrum, noting that many cannot convert plant vitamin A and need the good stuff he includes in his Vitam DAKNE product.
- Suggests that zinc has better safety and protective data than meds for reducing cardio respiratory risk.
- Dave Asprey recommends Vitamin D3 with K2, explaining D3 is a hormone made from sunlight and K2 directs calcium into bones, not arteries, highlighting its low cost, widespread deficiency, and the ability to test its effectiveness.
Siim Land · Vitamin D · recommends
- Advises against taking vitamin D in the morning with other supplements because it is fat soluble and requires dietary fat for better absorption.
- Recommends taking Vitamin D with fat for better absorption.
- Recommends taking vitamin C with collagen to support joint collagen synthesis.
- States that Vitamin D connects biology to light and that UVB reaching the skin enables its production.
- States that vitamin C is needed for initiating collagen synthesis and that higher vitamin C intake appears to increase vitamin C content in the skin.
- Lists sauerkraut and fruit as sources of Vitamin C.
- Lists liver and carrots as sources of Vitamin A.
- Thinks vitamin D has some of the strongest evidence and is worth considering.
- Notes that Vitamin K2 pairs well with vitamin D by regulating calcium and bone mineralization.
- Notes that Vitamin C is one of several supplements with human evidence.
- Recommends taking vitamin D supplements with some fat to maximize its absorption, suggesting with food or a teaspoon of olive oil.
- Notes that taking vitamin D3 with a fat-containing meal resulted in 32% higher peak blood vitamin D levels.
- Recommends taking Vitamin D in the morning or at lunch with fat.
- Notes that Boron improves vitamin D.
Andrew Huberman · Zinc · uses
- Zinc carnosine to support and improve the lining of your gut.
- Notes that AG1 Pro contains zinc carnosine to support and improve the lining of the gut.
- States that AG1 Pro contains zinc carnosine to support and improve the lining of the gut.
- Uses AG1 Pro, which contains zinc carnosine to support and improve the lining of the gut.
- States that AG1 Pro contains zinc carnosine to support and improve the lining of the gut, and he was already taking some of these ingredients separately.
- States that AG1 Pro includes zinc carnosine, which he was already taking separately, to support and improve the lining of the gut.
- Notes that most people are probably deficient in vitamin D and benefit from supplementing, but there's no point in doing it unless you're deficient for most things.
- Personally takes zinc carnosine, which is included in AG1 Pro to support and improve the lining of the gut.
- AG1 Pro has zinc carnosine to support and improve the lining of your gut. Some of these ingredients I personally was already taking separate from the AG1 formula.
- States that AG1 Pro contains zinc carnosine to support and improve the lining of your gut.
- Uses AG1 Pro, which contains zinc carnosine to support and improve the lining of the gut.
- Takes 5,000 IU of Vitamin D3 in the morning for longevity.
- Takes 5000 IU of Vitamin D3 in the morning for general health.
- States that Vitamin D is one of the critical nutrients with the best evidence for cognitive function and reducing the risk of dementia.
Ben Greenfield · Zinc · warns
- Ben Greenfield's formulation includes 30 grams of zinc a day, taken for one week before surgery and two weeks after, as it is an important cofactor for wound healing.
- Mentions a recent study showing no significant increase in bleeding for patients on Vitamin E supplementation during open heart surgery, which was interesting for him to learn.
- States that vitamin C is extremely important for collagen turnover and cites orthopedic data showing that 500 mg to 1 g of vitamin C can reduce the rate of complex regional pain in total knee replacements and wrist fractures.
- Notes that Vitamin D is actually a hormone and recommends patients aim for levels around 40 to 50, or even 60 for fracture healing, for optimal healing, as opposed to just above 20 which is considered normal.
- Notes that Vitamin A is a fat-soluble vitamin that supports healthy skin cell turnover.
- Mentions vitamin C as part of a bare-minimum protocol.
- Mentions vitamin D as part of a bare-minimum protocol.
- Advises getting vitamin D levels between 60 and 100 nanograms per milliliter as a minimum step for overall health and to slow down heart disease.
- Mentions chromium as a secondary ingredient in blood sugar control products, along with vanadium and bittermelon extract.
- Warns that folic acid is an inactive form of folate that the body cannot efficiently convert, meaning one won't get the full benefit.
- Emphasizes that zinc sufficiency is crucial for immunity because the thymus-derived peptide thymulin, which trains lymphocytes, requires zinc to be active.
- Notes that while vitamin C has significant value, the optimal dose is a vexed question, and high doses might not always be beneficial, potentially blunting the hormetic effects of exercise.
- Recommends adding zinc into one's stack because it is a co-factor for enzymes involved in testosterone synthesis and sperm maturation, and zinc deficiency is a reproducible cause of low sperm count.
- He mentions zinc as a supplement with real human data behind it for male fertility.
Dr. Mark Hyman · Vitamin D · recommends
- Recommends Vitamin D for health, stating that amazing things happen when patients' vitamin D statuses reach optimal levels.
- Mentions vitamin D as an existing biomarker that plays a role in mental health, which Function Health includes in their measurements.
- Notes that vitamin D plays a role in immune function.
- Mentions that vitamin A levels can be looked at to get a deep sense of what's happening with nutrient levels.
- Recommends vitamin C as a basic supplement during detoxification to help with inflammation and detoxification.
- Recommends checking vitamin D levels and states that if they had to pick one single intervention for immune health, vitamin D would be it.
- Dr. Hyman discusses vitamin D in relation to sun exposure patterns.
- States that vitamin D supplementation can help with oxidative stress.
- Dr. Hyman mentions vitamin C as an advanced therapy for skin repair.
- Mentions topical vitamin C as an antioxidant that can help skin with aging.
- Gave a patient with psoriatic arthritis a little zinc, which contributed to significant improvement in her condition.
- Mentions that what they do when a cold comes on is not just vitamin C.
- Mentions vitamin D as a key nutrient for supporting immune function.
- States that vitamin D is probably the single most important intervention for immune health, recommending levels of 45 to 70 and emphasizing testing to determine the right dose.
Thomas DeLauer · Vitamin C · recommends
- Recommends taking vitamin C along with collagen about an hour before a workout for connective tissue benefits.
- Uses vitamin C as part of their immunity duo, stating it is important for boosting the immune system, especially during cold and flu season.
- Adds zinc to their immunity duo because it helps them absorb vitamin C, considering the two together a fantastic combination for fall and winter.
- Uses vitamin D3 in the fall and winter months when getting less sun, as it's important to supplement it then.
- Recommends taking a massive amount of vitamin D simultaneously with an early morning massive breakfast to help reset circadian rhythms and address hyperphagia.
- Recommends Vitamin B12 for mental health and mood, explaining its role in myelination and neurotransmitter production. They specifically recommend a liposomal and micellar form of methylcobalamin B12 for better absorption and to avoid toxicity.
- Recommends zinc, noting it is a cofactor for enzymes that build neurotransmitters, and deficiency can affect mood, happiness, and motivation.
- Recommends Vitamin D, stating that it has receptors throughout the brain and deficiency can quickly impact brain and mood.
- Takes supplemental vitamin D because he is skin sensitive and from northern latitudes, limiting his UV exposure.
- Recommends taking vitamin D on non-liver days to ensure both nutrients get proper receptor access.
- Warns that synthetic folic acid supplements may not convert effectively in many people due to a gene variant, potentially blocking cellular folate uptake and masking B12 deficiencies.
- Recommends consuming vitamin C to aid in NADPH recycling, which is necessary for glutathione to be reused after neutralizing oxidative stress.
- Mentions that more zinc could be beneficial for testosterone, but it's not working on the axis that most people need help with.
- Takes Purity's liquid liposomal vitamin C for immune support and overall wellness, finding it easy to add to water, juice, or take straight up due to its good taste.
Bryan Johnson · Vitamin D · uses
- Takes 5000 IU of Vitamin D3 in the morning for general health.
- Takes 5000 IU of Vitamin D3 in the morning for general health.
- Mentions that the sunlight assessment claims low vitamin D levels cause the immune system to misfire, and notes that their vitamin D has been measured.
- Takes 5000 IU of Vitamin D3 in the morning for longevity.
- Takes 15 mg of Zinc in the morning for longevity.
- He takes 5000 IU of Vitamin D3 in the morning for general health.
- Takes 5000 IU of Vitamin D3 in the morning for general health.
- Takes 5,000 IU of Vitamin D3 in the morning for longevity.
- Takes 5,000 IU of Vitamin D3 in the morning.
- Takes 15 mg of Zinc in the morning.
- Takes 5,000 IU of Vitamin D3 in the morning.
- He takes 5000 IU of Vitamin D3 in the morning for general health.
- Takes 15 mg of Zinc in the morning for longevity.
- States that Blueprint essential capsules and soft gels are packed with key vitamins and minerals needed for strong bone health.
Dr. Rhonda Patrick · Vitamin D · neutral
- Vitamin D supplementation was linked to a 40% lower risk of dementia in an observational study of more than 12,000 older adults.
- Mentions that vitamin D also plays a role in maintaining muscle mass.
- Notes that not getting enough zinc can affect testosterone, as zinc is very important for testosterone synthesis.
- Recommends ensuring adequate vitamin D intake for men's sperm health.
- Recommends men take a 30 milligram zinc supplement for sperm health when preparing for IVF.
- Recommends a combination of methyl folate and folic acid, as folic acid has been shown to reduce neural tube defects.
- Vitamin D and strength training alone did not, but adding them strengthened the effect on one clock, with the full combination slowing that measure by ~3.8 months.
- Lutein and zeaxanthin can also be obtained from certain multivitamins.
- Lutein and zeaxanthin can also be obtained from certain multivitamins.
- Lutein and zeaxanthin can also be obtained from certain multivitamins.
- Lutein and zeaxanthin can also be obtained from certain multivitamins.
- Discusses findings from a meta-analysis on zinc supplementation, noting it improved insulin resistance, inflammation, and oxidative stress in people with diabetes or prediabetes, and explains its biological role in the pancreas.
- Recommends Vitamin D, noting it regulates over 5% of the genome, including genes involved in immune defense, neurotransmitter synthesis, and longevity, and correcting deficiency may slow epigenetic aging.
- Uses Vitamin D3 as an example of a supplement that an AI model could track to see its impact on other metrics like glucose levels.
Peter Attia · Vitamin D · uses
- Lists vitamin D as one of her staple supplements.
- Suggests that zinc and magnesium could potentially help with vasodilation and sleep, particularly for women experiencing severe symptoms in the luteal phase.
- Notes that several studies show patients taking vitamin D can reduce TPO levels and prolong the honeymoon period of Hashimoto's disease.
- States that in mouse studies, there was a combined effect of alpha ketoglutarate with vitamin D for both sexes.
- Notes that in mouse studies, there was a combined effect of alpha ketoglutarate with vitamin A for male mice.
- Uses vitamin D as an example of how people might dismiss its efficacy due to failed clinical trials that didn't adjust the dose or measure levels.
- In mouse studies, Peter Attia's team found a combined effect of AKG with Vitamin D for both sexes.
- In mouse studies, Peter Attia's team found a combined effect of AKG with Vitamin A for male mice.
- Suggests that supplementing with lots of vitamin D might help overcome the negative effects of phenytoin on bone health by improving calcium absorption, though he is unaware of studies on this.
- Recommends Vitamin D3 as one of the 'big three' micronutrients for bone health, suggesting a daily intake of 800 to 1,000 IU, which can be obtained through sunlight or supplementation.
- Suggests that supplementing with lots of vitamin D might overcome the negative effects of phenytoin on bone health by counteracting increased catabolism of vitamin D and subsequent decreased calcium absorption.
- Recommends vitamin C as an important molecule for skin, noting its role as a precursor for collagen synthesis, a powerful antioxidant, and a regulator of complexion for even skin tone.
- Tried a vitamin C serum mixed with ferulic acid but stopped using it because she hated the smell. She notes that topical application of vitamin C far exceeds the levels achievable by ingestion for skin benefits.
- Peter Attia's AVIA Skincare vitamin C serum also contains niacinamide, which is useful to apply to the skin right after washing.
RAL Summary
Members OnlyTier 4 for Thyroid Health
Human studies support Vitamin E (6 of 26 human studies showed an improvement), but there are not yet enough reviews to confirm it (0). The final check notes: The tier rests on vitamin E, but controlled trials giving vitamin E alone found no change in thyroid function and its reported improvements came only from mixes with selenium, so vitamin E does not support this goal, though thin evidence and no reviews still place the product at tier 4.
- Emerging: not enough evidence to rank higher yet.
Where the evidence disagrees: 92 of the 156 human studies found no effect.
More Details
Members OnlyBody systems · Combine with · Possible side effects
Body systems: Endocrine system, Immune system
Possible side effects: Chromium can reduce absorption of meds, and biotin can distort thyroid blood test results; no other major side effects reported.
Supplement Facts
Total Carbohydrates 4 g · Vitamin A 4000 IU · Vitamin C 60 mg
Supplement Facts
Serving Size 2 Gummy(ies)
Servings Per Container 45
Amount Per Serving% Daily Value
| Calories | 20 | |
| Total Carbohydrates | 4 g | |
| Vitamin A | 4,000 IU | |
| Vitamin C | 60 mg | |
| Vitamin D3 | 400 IU | |
| Vitamin E | 30 IU | |
| Niacin | 13 mg | |
| Vitamin B6 | 5 mg | |
| Folic Acid | 400 mcg | |
| Vitamin B12 | 12 mcg | |
| Biotin | 100 mcg | |
| Zinc | 3.8 mg | |
| Chromium | 60 mcg | |
| Fish Oil | 227 mg | † |
† Daily Value not established.
Other ingredients: Corn Syrup, Sugar, Gelatin, Water, Citric Acid, Natural flavors, Lactic Acid, modified Food Starch, Colors added, Medium Chain Triglycerides, Corn Starch, White Beeswax, Tocopherols.
Directions: Suggested use: Chew two gummies daily.
Label source: NIH label database · Report a label change
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- What Supplements and Vitamins Should Not Be Taken TogetherArticle · Sep 7, 2026
Graded November 6, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.
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