Coptis Chinensis (Huang Lian)
A Chinese herb whose active compound is berberine. Almost all the human evidence comes from purified berberine hydrochloride rather than the herb, and the gut-infection use it is sold for remains largely traditional.
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What the science says
- Diarrhoea-predominant IBS Limited evidence
A randomized clinical trial of berberine hydrochloride in diarrhoea-predominant IBS reported reduced diarrhoea frequency and abdominal pain. It is a single trial, and it used the isolated compound rather than Coptis.
- Cholesterol and triglycerides Moderate evidence
A systematic review and meta-analysis of randomized placebo-controlled trials found berberine lowers LDL cholesterol and triglycerides. This supports berberine as a compound, not the whole herb, and is a different use from the gut claims.
- Gut infections Limited evidence
The traditional use for bacterial diarrhoea and intestinal infection rests on older, small and poorly controlled studies rather than modern randomized trials.
Dosage & safety
How to take it
Interactions
With medications
- cyclosporine and tacrolimus
Berberine inhibits CYP3A4 and P-glycoprotein and raises blood levels of these immunosuppressants. do not combine without medical supervision and drug level monitoring
- diabetes medication (metformin, sulfonylureas, insulin)
Berberine lowers blood sugar on its own, adding to the drug effect. monitor blood sugar and let your doctor adjust doses
- statins, calcium channel blockers and other CYP3A4 substrates
Slower breakdown can raise drug levels and side effects. check with a pharmacist before combining
- digoxin
P-glycoprotein inhibition can increase digoxin absorption and blood levels. do not combine without level monitoring
With other supplements
- other glucose-lowering supplements such as cinnamon or gymnema
Additive blood-sugar lowering. monitor rather than stacking blindly
Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.
Frequently asked questions
Does coptis (huang lian) work for gut infections?
The use of coptis for bacterial diarrhoea and intestinal infection rests on older, small, poorly controlled studies, so the evidence is limited. Most human data come from purified berberine, not the herb.
Is coptis the same as taking berberine?
Not exactly. Berberine is the active compound in coptis and has moderate evidence for lowering LDL cholesterol and triglycerides, but coptis products vary widely in berberine content and the herb itself has not been trialled the same way.
How much coptis or berberine should I take?
Berberine trials used 400–1500 mg/day in divided doses with meals, while coptis decoctions traditionally use 2–5 g of dried rhizome. Constipation is the usual dose-limiting effect.
Is coptis safe with medications?
Coptis berberine inhibits CYP3A4 and P-glycoprotein and can raise levels of cyclosporine, tacrolimus, digoxin and statins, and it lowers blood sugar alongside diabetes drugs. Never give coptis to newborns and avoid it in pregnancy and breastfeeding because of kernicterus risk.
Scientific references
Related in Gut health
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- Ginger Moderate evidence
- Inulin (Prebiotic Fiber) Moderate evidence