Evidence Level
Strong
Berberine has an impressive evidence base for metabolic health, with multiple RCTs showing blood sugar, lipid, and insulin sensitivity improvements comparable to first-line medications. For weight specifically, effects are modest but significant, with meta-analyses showing BMI and waist circumference reductions. The AMPK mechanism is well-characterized and provides a clear scientific rationale. Berberine is most effective in metabolically unhealthy individuals. Its main limitation is low bioavailability (addressed by newer forms) and GI side effects.