Berberine
About
About Berberine
Berberine is an isoquinoline alkaloid found in goldenseal, barberry, and Oregon grape, with multiple clinical trials demonstrating glucose-lowering efficacy comparable to metformin in type 2 diabetes. It has AMPK-activating, gut microbiome-modulating, and anti-inflammatory properties, making it one of the most clinically supported longevity nutraceuticals. It is commonly used as a natural alternative or adjunct to metformin in metabolic optimization protocols.
Science
Mechanism of Action
Activates AMP-activated protein kinase (AMPK) through mitochondrial complex I inhibition, improving insulin sensitivity, reducing hepatic glucose production, and inducing autophagy; also modulates gut microbiota composition and bile acid metabolism.
Dosing
Typical Protocol
500 mg oral 2–3x daily with meals; GI side effects common at higher doses; dihydroberberine (DHB) at 200 mg shows improved bioavailability.
⚠ Protocol information is for educational purposes only. Dosing must be determined by a licensed physician based on individual health status and goals.
Regulatory
Legal Status in 2026
This compound has completed clinical trials and received formal FDA approval for one or more indications. It can be legally prescribed by licensed physicians, filled at any licensed pharmacy, and may be covered by insurance. Off-label use by physicians is also legal. This is the highest level of regulatory clearance available in the US.
Evidence
Evidence Tier
Evidence from randomized controlled trials (RCTs) or large observational studies in humans. This is the gold standard — effects have been measured in controlled conditions and results are peer-reviewed and reproducible.
Find a Verified Provider
See which Vial-verified providers offer Berberine — with trust scores, legal credentials, and pricing transparency.