Guggul
Summary
Guggul resin contains guggulsterones, which act on cholesterol-regulating receptors. In the most rigorous Western trial (JAMA, 103 adults) guggulipid raised LDL cholesterol versus placebo and caused rash in 6 people. A Norwegian trial found small total-cholesterol drops, and a guggulu-triphala combination did no better than placebo. Guggul lowered propranolol and diltiazem absorption.
Key facts
- Hypersensitivity rash in 6 of 67 guggulipid users vs none on placebo (JAMA trial); rash also occurred in 2 of 46 on a guggulu-triphala blend[1][3]
- 1,000 or 2,000 mg three times daily for 8 weeks raised LDL by 4-5% while placebo fell 5%, a net 9-10% increase[1]
- A single 1 g dose of guggulipid significantly lowered blood levels (Cmax and AUC) of propranolol and diltiazem in healthy men[5]
- Two of 18 guggul users reported possible thyroid problems in a 12-week Norwegian trial[2]
- A 2021 meta-analysis of Ayurvedic trials reported total cholesterol down 16.8 mg/dL and LDL down 18.8 mg/dL with guggulu, contrasting with null Western trials[4][1][3]
- 4 graded human outcomes on this page
- October 13, 2026
How it works
ProposedGuggulsterones antagonise the bile-acid receptor FXR, a proposed route for cholesterol lowering, and activate the pregnane X receptor (PXR), which can induce CYP3A drug-metabolising enzymes. In mice, guggul extract raised T3 thyroid hormone. These are laboratory and animal findings; human relevance is uncertain.[1][6][7]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| LDL cholesterol in adults with high cholesterol | Worsened | Grade C | RCT · n = 103 · 2003 Healthy adults with hypercholesterolaemia eating a Western diet (Philadelphia, USA) Form: Guggulipid standardised to 2.5% guggulsterones · Dose: 1,000 mg or 2,000 mg three times daily · Duration: 8 weeks LDL rose 4% (standard dose) and 5% (high dose) vs a 5% fall on placebo (P = .01 and .006); total cholesterol, HDL and triglycerides did not change. 6 users had a hypersensitivity rash. | 12915429 (opens PubMed)Source [1] |
| Total and LDL cholesterol with guggulu plus triphala | No effect | Grade C | RCT · n = 90 · 2021 Adults at low-to-moderate cardiovascular risk with high cholesterol (Brescia, Italy) Form: Guggulu (Commiphora mukul) with triphala · Dose: Three times daily (product dose) · Duration: 3 months LDL fell 4.8% with the blend and 4.9% with placebo, with no difference; BMI and waist did not change. 2 on the blend developed a hypersensitivity rash. | 33242870 (opens PubMed)Source [3] |
| Total and LDL cholesterol (Ayurvedic trials) | Improved | Grade D | Meta-analysis · n = 1,386 · 2021 People with high cholesterol in 32 RCTs of garlic, guggulu or black cumin (pooled n for all three herbs) Form: Guggulu preparations (alone or combined) · Dose: Varied by trial · Duration: Average 12 weeks Guggulu lowered total cholesterol by 16.8 mg/dL and LDL by 18.8 mg/dL versus control. | 34071454 (opens PubMed)Source [4] |
| Total cholesterol in moderately high cholesterol | Mixed | Grade D | RCT · n = 34 · 2009 Adults aged 27-70 with moderately raised cholesterol in Norwegian general practice (43 randomised) Form: Guggul-based formulation · Dose: 2,160 mg/day · Duration: 12 weeks Total cholesterol and HDL fell versus placebo, but LDL, triglycerides and the total/HDL ratio did not change. 10 guggul users vs 4 on placebo reported side effects, including possible thyroid problems (2) and a generalised rash (1). | 19114224 (opens PubMed)Source [2] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| Guggulipid (standardised to guggulsterones) | Varies[1] | No human pharmacokinetic data for guggulsterones in the cited sources.[1] | Generally well tolerated apart from hypersensitivity rash in about 1 in 11 users in the JAMA trial; headache, nausea, belching and loose stools are also listed.[1][6] | Cholesterol trials at 3,000-6,000 mg/day |
| Ayurvedic guggulu blends (e.g. with triphala) | Varies[3] | Not studied for absorption.[3] | Rash in 4.3% of blend users in one trial.[3] | Cholesterol trial of guggulu with triphala |
Studied doses
Doses studied in human trials ranged from 2,160 mg/day of a guggul formulation for 12 weeks to 3,000-6,000 mg/day of guggulipid (1,000-2,000 mg three times daily) for 8 weeks.[1][2]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
Medicines
- Propranolol and diltiazemPK studyA single 1 g dose of guggulipid significantly reduced their peak blood levels and total exposure, which could make them less effective.[5]
- Statins and other CYP3A4 substratesReviewGuggulsterone activates PXR and induces CYP3A genes in lab studies, and MSK warns guggul may make CYP3A4 substrate drugs less effective. Guggul did not lower LDL in the JAMA trial.[6][1]
- Thyroid medicinesRCTPossible thyroid problems were reported by 2 guggul users in a 12-week trial; effects on thyroid treatment have not been studied.[2]
Other supplements
- Red yeast riceCase reportSevere liver inflammation occurred in a woman taking a product combining guggulsterol and red yeast rice; it resolved after stopping.[8]
Who should be careful
- People with a history of drug or herbal rashes
- Hypersensitivity rash was the most consistent side effect across trials.[1][2][3]
- People on propranolol, diltiazem, statins or other CYP3A4 drugs
- Guggul reduced absorption of two heart drugs and may speed metabolism of CYP3A4 substrates.[5][6]
- People with thyroid conditions
- Possible thyroid problems were reported by 2 guggul users in a trial, gugulu raised T3 in mice, and MSK lists raised TSH, T3 and T4 among lab effects; we found no human thyroid studies.[2][7][6]
- Hormone-sensitive conditions
- Guggulsterone activates oestrogen-alpha and progesterone receptors in lab studies, so people with hormone-sensitive cancers or conditions should be cautious; we found no human data on this.[6]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
Safety first
Rash and drug interactions are the main concerns.
- Rash
- 6 of 67 guggulipid users developed a hypersensitivity rash in the JAMA trial, versus none on placebo.[1]
- Gut effects
- Mild gastrointestinal discomfort was reported by 7 of 18 guggul users in the Norwegian trial.[2]
- Liver
- A case of severe hypertransaminasaemia involved a combined guggulsterol and red yeast rice product.[8]
How to read the label
- Guggulsterone contentThe JAMA trial used guggulipid standardised to 2.5% guggulsterones; products vary.[1]
Frequently asked questions
Does guggul lower cholesterol?
Not reliably. In the most rigorous trial it raised LDL slightly versus placebo, though Ayurvedic trials pooled in a meta-analysis report reductions.[1][4]
What are the main side effects?
Skin rash is the most consistent; stomach upset and possible thyroid problems were also reported.[1][2]
Does guggul interact with heart medicines?
It lowered blood levels of propranolol and diltiazem in a pharmacokinetic study.[5]
Can I take guggul with a statin?
Guggul may speed metabolism of CYP3A4 drugs such as several statins, according to lab data; there are no human combination studies.[6]
Does guggul affect the thyroid?
Possibly. Two participants in a 12-week trial reported thyroid problems; we found no human thyroid studies.[2]
Sources
- [1]Guggulipid for the treatment of hypercholesterolemia: a randomized controlled trial.. JAMA, 2003. RCT
- [2]Resin from the mukul myrrh tree, guggul, can it be used for treating hypercholesterolemia? A randomized, controlled study.. Complement Ther Med, 2009. RCT
- [3]Guggulu and Triphala for the Treatment of Hypercholesterolaemia: A Placebo-Controlled, Double-Blind, Randomised Trial.. Complement Med Res, 2021. RCT
- [4]A Systematic Review and Meta-Analysis of Ayurvedic Herbal Preparations for Hypercholesterolemia.. Medicina (Kaunas), 2021. meta-analysis
- [5]Effect of gugulipid on bioavailability of diltiazem and propranolol.. J Assoc Physicians India, 1994. PK-study
- [6]Guggul (About Herbs). Memorial Sloan Kettering Cancer Center, 2022. database
- [7]Gugulu (Commiphora mukul) induces triiodothyronine production: possible involvement of lipid peroxidation.. Life Sci, 1999. animal-study
- [8]Acute hepatitis caused by a natural lipid-lowering product: when "alternative" medicine is no "alternative" at all.. J Hepatol, 2009. observational
What changed
- Initial editorial evidence review: source titles and years taken from NCBI E-utilities esummary (no retraction or expression-of-concern flags), every evidence row, dose, n and duration read against the PubMed abstract or full text, funding and author affiliations checked where available, and grades held conservative.