Berberine HCl (from Berberis aristata)

Metabolism & blood sugar

Function & benefits

A plant alkaloid from barberry root that activates AMPK, the main energy sensor in cells; it helps support muscle insulin sensitivity, reduce glucose production in the liver and support normal cholesterol and triglyceride levels.

Dosage & how to use

Recommended dose	500 mg per dose (1000–1500 mg a day at most); start with 500 mg a day
Best time to take	15–30 minutes before meals
Frequency	2–3 times daily

Best forms to choose

Berberine HCl (97%), or newer phytosome formulas that raise its naturally low absorption.

Important warnings

Strictly not for use during pregnancy or breastfeeding: it crosses the placenta and reaches breast milk and may cause kernicterus in unborn and breastfed babies

May cause temporary intestinal cramps and diarrhoea

Do not use it instead of prescribed diabetes medication

Drug interactions

Critical interaction: it inhibits the liver enzymes CYP3A4 and CYP2D6 and interacts with glucose-lowering drugs (risk of severe hypoglycaemia with insulin), statins, blood pressure drugs and immunosuppressants (ciclosporin, tacrolimus). Consulting a doctor is essential.

View in the supplements guide

Related supplements

Scientific references

Zhang Y et al. J Clin Endocrinol Metab 2008 — PMID: 18397984
NIH National Center for Complementary and Integrative Health (NCCIH): Goldenseal (berberine)

📚 Published sources and research: European Food Safety Authority (EFSA) • National Institutes of Health (NIH - ODS) • PubMed / Cochrane databases

Content last updated: 17 October 2026 · Based on published sources and research (EFSA / NIH / PubMed)

⚖️ Medical disclaimer: The information and data provided here are for health education and nutritional guidance only. They are not a medical diagnosis and never replace a direct consultation with your doctor or pharmacist. Always consult your doctor before starting any supplement, especially during pregnancy or breastfeeding or when taking long-term medication.