SupplementModerate evidenceImmunity

Berberine

Plant alkaloid with meta-analysis support comparable to metformin for glycemic control and to statins for LDL, strong but used with care.

Why

Berberine is an isoquinoline alkaloid found in several botanicals (Berberis aristata, Coptis chinensis, goldenseal). Meta-analyses of >25 RCTs in type 2 diabetes report reductions in HbA1c, fasting glucose and postprandial glucose comparable to metformin monotherapy. A separate meta-analysis in dyslipidaemia reports LDL reductions in the range of low-dose statins. Effect is real but the molecule has meaningful pharmacology, not a casual supplement.

How it works

Activates AMP-activated protein kinase (AMPK), the same target as metformin. Inhibits hepatic PCSK9 expression and upregulates LDL receptors. Modulates gut microbiota composition (Akkermansia, Bacteroides) which appears to contribute to the metabolic effect.

Expected onset · Glycemic effects emerge over 2–4 weeks; lipid effects over 6–12 weeks

How to take

Dosage

500 mg two or three times daily before meals (1,000–1,500 mg/day total).

Timing

30 minutes before meals

On the label

Look for 'berberine HCl' with stated milligrams. Plant extracts (goldenseal, Berberis) vary widely; standardised berberine HCl is the form used in clinical trials.

Ideal for

Adults with prediabetes, mild type 2 diabetes, or mixed dyslipidaemia seeking an evidence-supported botanical option, best with clinical supervision when overlapping with prescribed medications.

Safety

Pharmacologically active, treat as a medication, not a casual supplement. Common GI side effects (constipation, cramping, diarrhoea), start at 500 mg once daily and titrate. Strong CYP3A4 and CYP2D6 inhibition: substantial interaction risk with statins (especially simvastatin), ciclosporin, warfarin, midazolam, and many cardiovascular drugs. Hypoglycaemia risk if combined with insulin or sulphonylureas. Avoid in pregnancy (kernicterus risk in neonates), breastfeeding, and severe liver disease.

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Evidence

At a glance

Dong 2013 Planta Med meta-analysis (14 RCTs, n=1,068 type 2 diabetes): berberine reduced HbA1c, fasting and postprandial glucose comparably to metformin and was additive to lifestyle measures. Koppen 2017 Pharmacol Res review reported LDL reductions of 20–25% on 500 mg twice daily, magnitude comparable to low-dose statins. Strong effect, real interaction profile.

Where to get it

Shop Berberine on Amazon

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