Supplement analysis backed by scientific evidence · PT

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Limited evidenceHeart & metabolic

Guggul

Guggul is the textbook case of an herb that looked good in early Indian trials and then failed in the West: a JAMA-published RCT found guggulipid raised LDL cholesterol rather than lowering it. It is not a credible cholesterol supplement.

What the science says

  • Lowers LDL cholesterol Limited evidence

    The pivotal 103-person double-blind RCT gave guggulipid (2.5% guggulsterones) at 1000 mg or 2000 mg three times daily for 8 weeks in hyperlipidaemic adults on a Western diet. LDL rose 4-5% on guggul while falling 5% on placebo — a net adverse difference of 9-10% (p=0.01 and p=0.006). Total cholesterol, HDL and triglycerides were unchanged.

  • Multi-herb Ayurvedic guggul formulas improve lipids Limited evidence

    A later placebo-controlled double-blind trial of guggulu plus triphala in hypercholesterolaemia likewise failed to demonstrate a meaningful lipid benefit over placebo. Reviews of the older positive Indian literature note that those studies were small, frequently unblinded, and used populations on very different background diets, which is the most likely explanation for the discrepancy.

  • Helps weight loss and thyroid function Limited evidence

    Guggulsterones antagonize the farnesoid X receptor and were speculated to stimulate thyroid function, but no controlled human trial shows weight loss or clinically relevant thyroid changes. This claim is mechanism-based marketing.

Dosage & safety

Studied doseStudied doses were 1000-2000 mg of standardized guggulipid three times daily (25-75 mg guggulsterones/day) for 8 weeks; traditional Ayurvedic guggulu preparations use 1-3 g/day of purified resin. Given the negative and adverse trial results, no dose can be recommended for lipid lowering.
SafetyIn the JAMA trial 6 participants on guggul developed a hypersensitivity rash versus none on placebo — a distinctive and reasonably common adverse effect. Gastrointestinal upset, nausea and loose stools are frequent. Guggul induces CYP3A4 and P-glycoprotein and has been reported to reduce plasma levels of propranolol and diltiazem; it may also interfere with thyroid medication, warfarin and other narrow-therapeutic-index drugs. Contraindicated in pregnancy (uterine stimulant activity), in hyperthyroidism, and before surgery due to antiplatelet effects. Do not use it as a substitute for a statin.

Scientific references

Where to buy

Vitacost, Guggul Extract Blend, 100 Capsules (500 mg per Capsule)

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