Research synthesisLow evidenceSmall effect4 studies · 2 beneficial · 2 neutral · 0 harmful
Across 4 studies (2 RCTs, 1 meta-analysis, 1 systematic review), evidence for berberine reducing body mass index is mixed: 2 meta-analyses reported small beneficial effects, while 2 higher-quality RCTs found no significant difference. The predominant effect size among beneficial studies is small. Most studies used doses of 500 mg twice daily (1000 mg/day) to 1200 mg/day in clinical populations (hyperlipidemia, type 2 diabetes, obesity), with a median study duration of 84 days.
- Effective dose range: 500 mg twice daily (1000 mg/day) to 1200 mg/day
- Studied populations: clinical populations including Chinese men with hyperlipidemia, patients with type 2 diabetes, and adults with obesity
Caveats: Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The two highest-quality RCTs found no effect, while lower-quality meta-analyses found small benefits.
Generated Jul 15, 2026