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Evidence-Based Supplement Research
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Black Cumin and Reduced Body Weight

Research synthesisModerate evidenceSmall effect5 studies · 3 beneficial · 2 neutral · 0 harmful

Across 5 studies, 3 reported beneficial small-to-moderate effects of black cumin on reduced body weight, with 2 showing neutral results. The largest meta-analyses (n=5026, n=2145) support significant reductions (weighted mean difference ~1.59 kg). Median study duration was 56 days (8 weeks). Most studied doses ranged from 200 to 4600 mg/day, but no clear optimal dose emerged. Effects were observed in clinical populations with metabolic diseases, type 2 diabetes, PCOS, and postmenopausal hypertension.

  • Studied populations: patients with metabolic diseases, type 2 diabetes, PCOS, postmenopausal women with hypertension

Caveats: The evidence is mixed: two meta-analyses show benefit, but one meta-analysis in type 2 diabetes found no significant effect. Doses varied widely, and specific forms (e.g., oil vs. powder) were not consistently reported, making it difficult to isolate active components. The overall effect size is small, and clinical significance may be modest.

Generated Jun 10, 2026
Doses used in studies
  • mg/day: 200–4,600 (median 1,000, IQR 300–2,800) — 3 studies
Time to effect
Median: 8 weeks · IQR 4.5 weeks–2.8 months · Range 7 days–3.7 months — Reported in 3 of 5 studies
5 of 5 papers
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