Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

Black Cumin and Reduced Body Mass Index

Research synthesisModerate evidenceMixed effect size3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 meta-analyses, 2 reported beneficial effects of black cumin (Nigella sativa) supplementation on body mass index (BMI), with effect sizes ranging from small (WMD -0.51 kg/m²) to moderate. One meta-analysis of 82 RCTs (5026 participants) found significant improvements, while a meta-analysis in type 2 diabetes patients showed no significant effect. The evidence base is small and limited by very short study duration (median 7 days).

  • Studied populations: patients with metabolic diseases (including obesity, dyslipidemia, etc.), general adult population with cardiovascular risk factors

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. The single reported study duration (7 days) is insufficient for meaningful BMI change; longer-term trials are needed. The only neutral study was in type 2 diabetes patients, suggesting possible lack of effect in that specific population. Dose range varied widely (200–4600 mg/day) with no clear convergence.

Generated May 16, 2026
Doses used in studies
  • mg/day: 200–4,600 (median 2,400, IQR 200–4,600) — 1 study
Time to effect
Median: 7 days · IQR 7 days–7 days · Range 7 days–7 days — Reported in 1 of 3 studies
3 of 3 papers
Back to top