Berberine

Also known as: berberine HCl, berberine hydrochloride

Grade A — Strong Evidenceplant compoundmetabolic

Recommended Dosage

500–1500 mg

With meals, split into 2-3 doses

Berberine is a bioactive compound extracted from several plants, including goldenseal, barberry, and Oregon grape. It's gained significant attention for its metabolic effects — multiple clinical trials show blood glucose reductions comparable to metformin, the first-line diabetes drug. Berberine activates AMPK (AMP-activated protein kinase), often called the body's "metabolic master switch," which is also activated by exercise and caloric restriction.

TL;DR: Potent plant alkaloid with metformin-like effects on blood sugar. Also activates AMPK (longevity pathway). Multiple drug interactions.

🧬Longevity🦠Gut Health❤️Heart Health
Last reviewed: 2026-03-09

Evidence Rating: Grade A — Strong Evidence

Multiple high-quality RCTs, systematic reviews, or meta-analyses with consistent findings.

Interaction Warnings

MetforminHigh Risk

Additive blood sugar lowering — risk of hypoglycemia

CyclosporineHigh Risk

Significantly increases cyclosporine levels — AVOID

CYP3A4 substratesModerate

Inhibits CYP3A4 enzyme — may increase levels of many drugs

WarfarinModerate

CYP2C9 inhibition; may increase warfarin levels — monitor INR

⚠️ Important Notes

  • Can cause GI upset initially
  • Not for pregnant/nursing women
  • Cycle use: 8 weeks on, 4 weeks off

Clinical Evidence (3 studies)

Efficacy of berberine in patients with type 2 diabetes

Yin J et al. (2008) — Metabolism

Berberine 500mg TID lowered fasting glucose, HbA1c comparably to metformin

View on PubMed

Meta-analysis of berberine for T2DM

Dong H et al. (2015) — Planta Med

Significant improvement in T2DM glycemic markers

View on PubMed

Berberine vs metformin: AMPK activation

Zhang Y et al. (2008) — J Clin Endocrinol Metab

Comparable glucose lowering mechanism via AMPK

View on PubMed

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

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