Nature Made Extra Strength B12 2500 mcg Review
Product Focus: Occasional Heartburn: Fast ReliefAlso covers:Digestion
Tier ⓘ
Tier 4 · Rank 14
Tier 4 · Emerging. A promising mechanism or animal data, with thin human evidence so far. Rank 14 within Tier 4 for Occasional Heartburn: Fast Relief; 23 of 27 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.
Biohacker Mentions
0 of 10
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Study, Trial or Testing Result Summary
Members Only11 human studies · 8 improved
11 human studies8 improved3 no effect666 people studied
This product's best fit for fast heartburn relief is its calcium, not its vitamin B12. Members reach a full calcium dose only at three servings a day. The label does not say which form of calcium it uses, while the relief studies used calcium carbonate. In small placebo-controlled trials, a single dose of calcium carbonate lowered acid in the food pipe and eased meal-related heartburn [1]. Calcium carbonate gum or chewable tablets reduced heartburn within 15 to 30 minutes [2]. Calcium and magnesium carbonate antacids raised stomach acid levels within minutes, but the effect wore off quickly [3][4]. A calcium carbonate gum with other ingredients also lowered heartburn scores after a trigger meal [5]. For frequent heartburn over 12 weeks, as-needed calcium carbonate worked less well than a daily acid-reducing drug [6]. Vitamin B12 is well above the studied dose, but it has not been tested alone for heartburn. One trial gave it as part of a multi-ingredient mix, so that result cannot be credited to it [7]. A small study without a comparison group found that B12 eased indigestion in people with low B12 and a stomach infection [8]. No reviews were available. Animal and cell studies are never counted.
See all 11 studies →Hide the studies
- In 351 people with acid reflux, a combination supplement that included vitamin B12 led all 176 users to report complete symptom regression after 40 days, compared with 65.7% of those taking 20 mg a med (a standard acid-reducing drug), but B12 was not tested on its own.Read the study on PubMed (16948779) →
- In 155 adults with frequent heartburn, as-needed calcium carbonate antacid for 12 weeks worked less well than twice-daily effervescent ranitidine, with more rescue antacid use and less healing of the oesophagus (29% vs 55%), though quality of life improved with both.Managing heartburn at the 'base' of the GERD 'iceberg': effervescent ranitidine 150 mg b.d. provides faster and better h…
- In 26 adults with frequent meal-related heartburn, a single 420 mg dose of calcium carbonate lowered acidity in the oesophagus and reduced heartburn severity compared with placebo.Synergy between low-dose ranitidine and antacid in decreasing gastric and oesophageal acidity and relieving meal-induced…
- In 24 adults given a heartburn-provoking meal, single doses of calcium carbonate gum or chewable tablets reduced heartburn and raised oesophageal pH within 15-30 minutes compared with placebo, with the gum lasting longer than the tablets.Clinical effectiveness of a new antacid chewing gum on heartburn and oesophageal pH control.
- In 24 healthy volunteers, a single dose of a calcium and magnesium carbonate antacid raised stomach pH within the first 30 minutes compared with no treatment, but the effect was short-lasting.Comparison of two antacid preparations on intragastric acidity--a two-centre open randomised cross-over placebo-controll…
- In 24 adults with a history of reflux, a chewing gum containing calcium carbonate and other ingredients lowered heartburn and acid reflux scores after a trigger meal compared with placebo gum.Effect of GutsyGum(tm), A Novel Gum, on Subjective Ratings of Gastro Esophageal Reflux Following A Refluxogenic Meal.
- In 16 healthy fasting volunteers, a single 1360 mg dose of calcium-magnesium carbonate antacid raised stomach pH above 3 in a median of 5.8 minutes versus 240 minutes with placebo, acting faster than two acid-reducing drugs but wearing off sooner.Comparison of the effect of the antacid Rennie versus low-dose H2-receptor antagonists (ranitidine, famotidine) on intra…
- In people with nonulcer dyspepsia, calcium carbonate was linked to more reflux symptoms in those with a stomach lining condition (multifocal atrophic gastritis) once their Helicobacter pylori infection was cleared.Increased reflux symptoms after calcium carbonate supplementation and successful anti-Helicobacter pylori treatment.
- A new alginate and calcium carbonate liquid formed a raft and stayed in the stomach about as well as an existing Gaviscon liquid; the study did not measure heartburn relief in people.Alginate-antacid combinations: raft formation and gastric retention studies.
- In 12 healthy volunteers, a single 20 mL dose of an alginate antacid containing calcium carbonate significantly reduced food and acid reflux into the oesophagus after a test meal compared with no treatment.Effect of alginate and alginate-cimetidine combination therapy on stimulated postprandial gastro-oesophageal reflux.
- In 34 people with Helicobacter pylori infection and low vitamin B12, 1000 mcg daily for 3 months shortened stomach emptying time and reduced dyspepsia scores, with no control group.The impact of B(12) treatment on gastric emptying time in patients with Helicobacter pylori infection.
Review Totals and Summary
Members OnlyWhat buyers say
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Biohacker Summary
Members Only0 of 10 recommend it
0 of 10 biohackers on our panel recommend it
The product is a high dose vitamin B12 supplement, and the panel mostly backs B12, though it also spoke about calcium, which the statements list as a main ingredient. On B12, six of the ten recommend or use it, mainly for nerve protection, brain function, mood, and fixing a deficiency, with one linking it to gray hair and another to depression and PMS. The forms named are methylcobalamin (one wanted a liposomal or micellar version), with a sublingual form or injections suggested for older people, and one advised getting tested first, aiming for a level around 500. One panelist warned that B12 can add to light's effect on melatonin and should be avoided close to bedtime, and another said sardines alone supply several times the daily need. For calcium, half the panel recommends it for bone health, one cited 1,000 to 1,200 milligrams a day, while others warned that calcium carbonate may raise kidney stone risk and that calcium needs vitamin D, K2, and magnesium to work well, and several preferred food sources like sardines and leafy greens.
See all 10 biohackers →Hide the biohackers
Dr. Eric Berg · Calcium · warns
- Warns that bone loss cannot be fixed with just calcium, as bone is primarily collagen with other essential minerals.
- Dr. Berg includes calcium carbonate among the synthetic supplements to avoid.
- Recommends taking the natural form of vitamin B12, methylcobalamin, to support nerve regeneration, myelin production, and nerve growth factors.
- Notes that Vitamin B12 is intimately involved in the nervous system and may be behind sciatica and carpal tunnel syndrome.
- Warns against calcium carbonate, also known as limestone, stating that while it lowered hip fractures in a study, it also increased kidney stones and is not good for arteries, requiring the body to work hard to use it.
- Notes that tannins in tea bind calcium, blocking its absorption.
- Recommends taking vitamin B12 if on a med.
- Briefly mentions Vitamin B12 in relation to neuropathy.
- Indicates that horizontal thin white lines near the base of the nails are indicative of low calcium.
- States that vertical ridges on nails could mean a vitamin B12 deficiency, and slightly brown or grey nails, especially for vegans, could indicate low B12. Completely white nails with a pink strip across the top could also be low B12.
- Recommends incorporating vitamin B12 foods into the diet, especially for those who don't regularly consume animal products, to prevent irreversible damage to the nervous system.
- Warns that calcium carbonate can build up in the arteries and kidneys and increase the risk of a heart attack.
- Dr. Berg mentions that fermented dairy contains vital nutrients, including calcium.
- States that calcium and magnesium are intrinsically linked and work in combination with vitamin D to support the body's calcium balance.
Thomas DeLauer · Vitamin B12 · recommends
- 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.
- Notes that milk contains 120mg of calcium, while sardines contain 351mg, highlighting a 3x difference.
- Recommends getting calcium, along with vitamin D, zinc, and magnesium, from foods like sardines, as they are important for inflammatory pathways in the gut.
- Mentions that a single serving of sardines provides vitamin B12 at something like three to four times the daily needs.
- Explains that eating sardines with their soft bones provides a serious hit of calcium, which is a perfect combination for bones and may contribute to satiety.
- Recommends taking methylcobalamin as a methylated form of B vitamin for mitochondrial function.
- Mentions that magnesium and calcium should not be taken together as they cancel each other out.
- Tries to get multivitamins without calcium or with a low amount, as he believes supplemental calcium impacts the absorption of other vitamins and minerals and is not as beneficial as hyped. He cautions against it for most people due to the risk of coronary artery calcification.
- Recommends getting calcium from dairy sources like milk, yogurt, kefir, and cheese in the morning to support neurotransmitter synchronization crucial for deep and REM sleep, noting that low dietary calcium is linked to insomnia.
- Warns that calcium competes with magnesium for the same absorption channels, advising to separate magnesium intake from calcium supplements or dairy by at least an hour or two.
- Recommends providing the body with adequate dietary calcium, not a calcium supplement, to ensure a clean, strong spark for efficient insulin release.
- Warns that calcium and magnesium should not be taken together as they cancel each other out, though some products use delayed absorption to mitigate this.
- Warns that most people consume too much calcium relative to magnesium, which can disrupt the balance needed for proper bodily function, comparing it to an electrical circuit.
- Advises against taking vitamin B12 if one's diet already provides enough, suggesting a B complex or liver capsule instead for B vitamins.
Siim Land · Calcium · neutral
- Lists dairy and sardines as sources of Calcium.
- Notes that Boron reduces calcium/magnesium loss.
- Created Microvitamin, a supplement that bundled all the supplements he was taking, to help fund his a med trial.
- States that vitamin B12 deficiency is the most common reason for premature graying of hair and recommends fixing B12 status if it is deficient, as it gives a greater likelihood of reversing gray hair.
- Recommends a high calcium intake for bone health.
- Places calcium supplementation in the 'bad tier' due to its association with increased cardiovascular events, recommending dairy or bones as easier ways to get calcium, though it can be useful for postmenopausal women with low bone density.
- Mentions that eating enough calcium matters for bone density, but states that it alone won't transform bone density.
- Warns that calcium is linked to a higher risk of heart disease, though people with low calcium status and intake can take it safely.
- Warns that calcium supplements increase the risk of heart disease by raising blood calcium levels too high, leading to hypercalcemia and more calcium being stored in the arteries, and also increase the risk of arrhythmias.
- Warns against calcium supplementation for most people due to its association with increased cardiovascular events, but notes it can be useful for postmenopausal women with low bone density who don't consume dairy.
- Discusses Calcium as a supplement.
- Recommends consuming calcium from dairy, tofu, leafy greens, and bones, as it is a key nutrient required for ATP synthase in mitochondrial energy production.
- Takes 1 gram of Vitamin B12 from DoNotAge in the morning for longevity.
- Mentions Vitamin B12 as a key nutrient involved in the methylation cycle that helps prevent methionine from raising homocysteine levels.
Dr. Mark Hyman · Calcium · recommends
- Notes that calcium is in bones but is also essential for nerves, muscles, and the heart, and low levels can affect muscle function and heart rhythm.
- States that vitamin B12 is a nutritional deficiency that impacts mental health.
- Recommends vitamin B12 with vitamin B6 and folate as supplements with strong evidence for PMS.
- States that green leafy vegetables are great sources of calcium.
- Mentions that repletion of vitamin B12 can help safely withdraw someone from meds and that simple vitamin B12 deficiencies are important to address in a depression workup.
- Lists Vitamin B12 as important for nerve health and energy.
- Notes that calcium needs are lower than advertised and that stress, soda, and excess sugar can drive calcium loss.
- Does not prescribe calcium supplements at all, teaching people to get it from whole foods instead, because calcium supplements don't work for building bones or preventing fractures, and it's bone quality, not density, that matters.
- Warns that acid blockers inhibit calcium absorption.
- Lists calcium as another important nutrient that people can be tested for and measured.
- States that high doses of calcium supplementation in the elderly were not really impacting bone density, as osteopenic patients still became osteoporotic.
- Mentions vitamin B12 as a core nutrient required for methylation, noting that deficiencies can lead to various health issues.
- Recommends supplementing with Vitamin B12 for hair follicle health and growth, especially for vegans, as many people are deficient.
- Recommends checking vitamin B12 levels as a first step before taking any supplements.
Ben Greenfield · Vitamin B12 · recommends
- Recommends getting vitamin B12 tested and supplementing if deficient, as B12 deficiency can cause damage to the myelin coating around nerves, including cochlear nerves, and improve tinnitus severity scores.
- Is considering whether he needs a calcium supplement because lead can displace calcium in bones, affecting bone strength.
- Mentions calcium as a common deficiency.
- Recommends adequate intake of calcium for bone strength.
- Is using calcium chloride mixed with PRP before injecting for the P-shot.
- Advises people to stop taking calcium supplements as part of the Root Cause Protocol.
- Warns that in high doses, calcium without the right cofactors can raise cardiovascular risk by contributing to arterial calcification instead of bone strength, and may increase the risk of osteoporosis.
- Explains that 10X separates calcium and zinc into different micro beads, releasing them at different rates and locations in the digestive tract to prevent competition and optimize absorption.
- He recommends Vitamin B12, especially for kids on a vegan or vegetarian diet, as it is essential for nervous system development.
- Covers calcium as a key supplement for kids.
- Mentions that blood testing for an energy crisis would include nutritional things like a vitamin B12 level.
- Ben Greenfield consumes vitamin B12 as part of the Update Energy Drink.
- Warns of calcium deficiency on a carnivore diet, as there is not an appreciable amount in meat, and recommends eating fish with bones or taking a calcium supplement or bone mineral matrix.
- Lists vitamin B12 as a vitamin that, when combined with others, has a neuroprotective effect on the brain.
Dave Asprey · Vitamin B12 · recommends
- States that Vitamin B12 is extremely important for every kind of brain function and recommends ensuring B12 levels are optimal, around 500, not just barely above normal.
- Notes that when energy intake is too low for training demand, nutrient intake often falls short, especially for calcium, which is associated with reduced bone health.
- Explains that calcium provides the raw material for bones, but it isn't a standalone input and needs a whole system to be effective.
- Notes that people take calcium for their bones.
- Warns that taking calcium without vitamin D, A, and K2 can lead to calcium going into tissues, causing bone spurs and other issues, and recommends a two-to-one ratio of calcium to magnesium.
- Recommends taking calcium citrate during a high oxalate meal to bind the oxalate in the gut.
- Notes that people often take calcium for bone health.
- Recommends taking vitamin B12 if one has a deficiency.
- Believes calcium supplements are overrated, as most people need more vitamin K2 and vitamin D instead.
- Advises taking iron and calcium separately because they will bind together.
- Takes extra calcium to help deal with the burden when eating chocolate or anything with higher levels of oxalates.
- Dave Asprey notes that it's almost impossible to get vitamin B12 in a vegan diet, and it's primarily found in animal meat.
- Discusses calcium citrate as a counter to oxalate crystals, specifically when consumed through dairy, but questions if it's the primary form of calcium in dairy.
- Clarifies that Vitamin B12 is completely different from Vitamin B3 and is involved in different pathways, so there is no overlap with NAD pathways.
Dr. Rhonda Patrick · Calcium · neutral
- Mentions that kale delivers calcium, a micronutrient many diets fall short on.
- Notes additional gaps in calcium.
- Warns that Vitamin B12 enhances light's melatonin-suppressing effects and should be avoided too close to bedtime.
- Reports that alcohol use disorder is associated with a 20-50% greater prevalence of Calcium deficiency.
- Notes that a med can cause vitamin B12 deficiency, especially as absorption decreases with age, and suggests a sublingual form or B12 injections for older individuals.
- Discusses the origin of Vitamin B12, suggesting it's a microorganism that propagates in the soil and that animals get it from eating dirt, which is why it's less available in modern, sanitized plant foods.
- Around 38% doesn't meet the requirement for calcium.
- Takes a calcium-magnesium pill because he believes people tend to be short of both and that the body cares about the ratio of these similar molecules.
- Describes a study where female mice fed a diet high in B vitamins, folic acid, and vitamin B12 three weeks before pregnancy had offspring that no longer had yellow fur and were not predisposed to obesity and cancer.
- States that 1,000 milligrams of calcium per day is the recommended intake for bone density, and supplementation is an option if this requirement is not met.
- Takes a calcium, vitamin K2, and vitamin D combination supplement in the morning, providing about 600 mg of calcium and another 1,000 IUs of vitamin D.
- Dr. Rhonda Patrick discusses calcium needs.
- Dr. Rhonda Patrick explores vitamin B12 and autism risk.
- She takes methyl B12 as part of her Thorne multivitamin, which helps keep her homocysteine levels below 9 micromoles per liter.
Andrew Huberman · Vitamin B12 · neutral
- States that a deficiency in vitamin B12 can be terrible and lead to chronic fatigue-like syndromes, as many parts of mitochondria require B vitamins.
- Recommends taking methyl B12 as part of methylated B vitamins to lower homocysteine levels and reduce cardiovascular risk.
- Has been taking AG1 for over 10 years, once and often twice every day, to ensure he gets all necessary vitamins, minerals, probiotics, and adaptogens, considering it a nutritional insurance policy.
- Has been taking AG1 since 2012 to ensure he gets enough vitamins, minerals, Prebiotic fiber, and other nutrients typically found in fruits and vegetables, providing nutritional insurance.
- Andrew Huberman started drinking AG1 in 2012 and still drinks it once or twice a day because it provides all his foundational nutritional needs, ensuring proper amounts of vitamins, minerals, probiotics, and fiber for optimal mental health, physical health, and performance.
- Discusses "hard water" and the role of magnesium and calcium in cardiovascular health.
- Recommends the consumption of B12 and other B vitamins, especially folate, as it has been shown to partially decrease cancer risk in people who ingest alcohol, though it does not completely offset it.
- Started taking AG1 in 2012 and still takes it once or twice a day because it covers foundational vitamin, mineral, and probiotic needs, and supports immune system function and a healthy gut microbiome.
- He has been using Athletic Greens for over a decade to cover his vitamin and mineral bases and support his gut microbiome, immune system, gut-brain axis, and mental functions.
- Recommends Methyl B12 as part of methylated B vitamins to lower homocysteine and reduce cardiovascular risk.
- Adequate intake of calcium is vital for bone health.
Peter Attia · Calcium · recommends
- Recommends calcium as one of the 'big three' micronutrients for bone health, suggesting a daily intake of 1,000 to 1,200 milligrams, which can be supplemented with calcium carbonate or calcium citrate.
- Explains that bone is 50 to 70% mineral, predominantly calcium, and that virtually all of the body's calcium is contained within bone, making bone important for calcium homeostasis.
- Recommends calcium for bone health, stating that teenagers probably need about 1000 milligrams a day.
- Discusses bone acting as a reservoir for calcium and how resorption and formation release calcium into the blood when needed.
- Notes that deficiencies in certain vitamins and minerals, such as B12, can be a cause of hair loss in women.
- Notes that bone is 50 to 70 percent mineral, with calcium being the predominant mineral, and virtually all of the body's calcium is contained within bone.
- Recommends getting about a gram of calcium a day from organic bone meal, which provides calcium hydroxyapatite, the form humans are meant to consume.
- Suggests that calcium is one of the other signals involved in regulating mitochondrial number, beyond AMPK activation.
- States that in postmenopausal women not on estrogen, calcium and vitamin D have no protective effect against hip fracture because the problem is not the shell of the bone, which is fed by calcium and vitamin D, but the internal girder network.
- Explains that when a person is not responding to traditional B vitamins, they will step it up and give them methylcobalamin B12.
- Notes that compelling evidence links calcium to reduced risk of osteoporosis, which can impact mortality from specific causes.
- Notes that Ryan Lochte was suspended for a doping rule violation after a social media post showed him taking vitamin B12 in an illegal way, by IV infusion.
Bryan Johnson · Vitamin B12 · uses
- States that Blueprint essential capsules and soft gels are packed with key vitamins and minerals needed for strong bone health.
- Recommends calcium as a mineral that, along with phosphorus, magnesium, and boron, is deposited to fortify the bone structure after the collagen scaffold is in place.
- Agrees that a little extra calcium is probably okay, especially for women, to really hit home for bone mineral density.
- Recommends prioritizing calcium intake for postmenopausal women to help maintain bone density and reduce the risk of osteoporosis.
- Bryan Johnson takes Calcium daily as part of his Longevity Mix, which supports healthy bones and teeth.
- Recommends continuing with calcium to support bone health during the follicular phase.
RAL Summary
Members OnlyTier 4 for Occasional Heartburn: Fast Relief
Tier 4 fits because there are no reviews to confirm any benefit. The vitamin B12 evidence is indirect, while the calcium carbonate trials show short-lived fast relief.
Take 3 servings a day (3 tablets) to match the dose that worked in the studies.
- Emerging: not enough evidence to rank higher yet.
Where the evidence disagrees: 3 of the 11 human studies found no effect.
More Details
Members OnlyBody systems · Combine with · Possible side effects
Body systems: Digestive system
Possible side effects: No major side effects reported.
Supplement Facts
Vitamin B12 2500 mcg · Calcium 127 mg
Supplement Facts
Serving Size 1 Tablet(s)
Servings Per Container 60
Amount Per Serving% Daily Value
| Vitamin B12 | 2,500 mcg | |
| Calcium | 127 mg |
Other ingredients: Cellulose Gel, Stearic Acid, Magnesium Stearate, Croscarmellose Sodium.
Directions: Suggested use: Adults, take 1 tablet daily with water and a meal.
Barcode (UPC) 031604027186 · Label source: NIH label database · Report a label change
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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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