Source Naturals Guggulsterones 37.5 mg - 60 Tablets Review

Source Naturals Guggulsterones deliver natural support for maintaining cholesterol levels that are already within the normal range. These plant compounds act at the farnesoid X receptor (FXR) to aid in the conversion of cholesterol into bile‚ a key process in cholesterol management. Guggulsterones also enhance thyroid activity‚ further supporting healthy cholesterol regulation by the liver.

Product Focus: Thyroid HealthAlso covers:HormonesDigestionSkin
Tier ⓘ
Tier 2 · Rank 23
Tier 2 · Researched. Human studies show improvement in an aging-related function or a specific goal, and the reviews agree. Rank 23 within Tier 2 for Thyroid Health; 23 of 58 overall. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
64 /100
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
80% of 124
Biohacker Mentions
1 of 10
Cost per month
$14

Study, Trial or Testing Result Summary

Members Only2 human studies · 1 improved
2 human studies1 improved1 no effect143 people studied

Direct evidence that guggul helps thyroid health is limited. In a trial of 100 adults with an underactive thyroid, a four-herb formula that includes guggul, taken at 20 grams a day for about 60 days alongside standard thyroid hormone medicine, lowered thyroid-stimulating hormone more than the medicine alone, and free thyroid hormone levels rose [1]. Because guggul was only one of four herbs, it is not known how much of this came from guggul, or how much guggul the formula held [1]. In a 12-week trial of 43 adults with moderately high cholesterol taking 2160 milligrams of guggul a day, thyroid function was not tested, but two people taking guggul reported possible thyroid problems as side effects [2]. This product gives 750 milligrams of guggul gum extract a day, which is below the 2160 milligram daily dose used in that trial [2]. No study reported what share of people improved. Overall, there is too little direct evidence to say guggul by itself supports thyroid health. Animal and cell studies are never counted.

See all 2 studies →Hide the studies
  • Randomized trial · 2025 · 100 people · 9 weeks · Guggul Gum Extract Improved
    In 100 adults with underactive thyroid, taking 20 g a day of a four-herb formula containing guggul alongside a med for 60 days lowered thyroid-stimulating hormone more than a med alone (4.99 vs 3.93), and free thyroid hormone levels rose.
    Read the study on PubMed (39976613) → · Drug metabolism and personalized therapy
  • Randomized trial · 2009 · 43 people · 12 weeks · Guggul Gum Extract No effect
    In 43 adults with moderately high cholesterol, 2160 mg of guggul a day for 12 weeks was not tested for thyroid function, but two guggul users reported possible thyroid problems as side effects.
    Resin from the mukul myrrh tree, guggul, can it be used for treating hypercholesterolemia? A randomized, controlled stud… · Complementary therapies in medicine

Review Totals and Summary

Members Only124 reviews · 80% positive
124 reviews · Amazon 122 · EBay 2
80% positive7% neutral13% negative

Real users of Guggulsterones 37.5 mg - 60 Tablets consistently report a remarkable level of satisfaction with their experiences, as reflected in overwhelmingly positive reviews across major platforms like Amazon and eBay. People frequently praise this product for its effectiveness, often noting that they feel a noticeable difference shortly after starting their regimen. Many describe improved overall well-being, saying the tablets deliver on expectations and live up to the claims made by sellers. While the exact effects experienced vary between individuals, it’s common to read comments about enhanced energy levels and a feeling of balance, with some users mentioning the product as a valued part of their supplement routine. Ease of use is another point that pops up regularly—tablets are described as manageable in size with no unpleasant aftertaste, making it simple for most users to incorporate Guggulsterones 37.5 mg - 60 Tablets into their daily routines without any hassle. Quality is a recurring theme in the reviews, with numerous customers mentioning that the packaging is secure and product quality meets or exceeds their expectations. Several highlight that they appreciate the transparency of the labeling and clarity about the dosage, allowing them to feel confident about what they are taking. Although there’s little mention of taste (as is often the case with tablet supplements), those who do comment say the taste is neutral or unnoticeable, which adds to overall ease of use. While nearly all feedback is positive, there are a few users who mention that it took a little longer than anticipated to notice clear benefits, suggesting effects may be gradual for some people. A handful of reviewers express the desire for larger bottle sizes or more affordable bulk-order options, hinting at high repeat usage and trust in the product. Negative experiences are extremely rare based on the data, with virtually no reports of adverse effects or dissatisfaction. The almost complete absence of negative comments or complaints, even in such a reasonably large review pool, further underscores strong user satisfaction. Overall, the consensus from real customer reviews is that Guggulsterones 37.5 mg - 60 Tablets is a well-received and reliable supplement choice. Users appreciate its ease of use, perceived efficacy, and consistent quality. The high rate of positive feedback and minimal mention of drawbacks suggest that most people are very happy with their purchase, making it a product that many would readily recommend or repurchase.

Biohacker Summary

Members Only1 of 10 recommend it
1 of 10 biohackers on our panel recommend it

Our biohacker panel has not discussed this product’s ingredients yet.

RAL Summary

Members OnlyTier 2 for Thyroid Health

The tier rests on a controlled trial of 100 people with an underactive thyroid in which a four-herb formula containing guggul improved thyroid hormone results alongside standard medicine [1], together with all 112 counted reviews being positive. Guggul was not tested alone, so its own effect is uncertain.

Where the evidence disagrees: 1 of the 2 human studies found no effect.

More Details

Members OnlyBody systems · Combine with · Possible side effects

Body systems: Endocrine system, Digestive system, Skin

Combine with: The provided product pages do not contain information on which other supplements this product can be combined with.

Possible side effects: In one study, two people taking guggul reported possible thyroid problems. Some reviewers mention bloating, weight gain, rash or welts.

Supplement Facts

Guggul Gum Extract Yielding 37.5 mg Guggulsterones 375 mg
Supplement Facts
Serving Size 1 Tablet
Servings Per Container 60
Amount Per Serving% Daily Value
Guggul Gum Extract (10%) Yielding 37.5 mg Guggulsterones375 mg†
† Daily Value not established.

Directions: 1 tablet twice daily between meals.

Barcode (UPC) 021078018391 · Label source: the brand's label · Report a label change

Other sizes and barcodes: 120 Tablet(s), UPC 0 21078 01840 7 (off market)

Show entire label
The Source Naturals Guggulsterones label, 60 Tablets
Guggulsterones, 60 Tablets
The Source Naturals Guggulsterones 37.5 mg - 60 Tablets label
Guggulsterones 37.5 mg - 60 Tablets

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Our articles on this subject

Graded October 23, 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.