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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Black Cumin and Reduced Fasting Blood Glucose Levels

Research synthesisHigh evidenceMixed effect size7 studies · 6 beneficial · 1 neutral · 0 harmful

Across 7 studies (6 meta-analyses and 1 systematic review), 6 reported beneficial effects on fasting blood glucose, with effect sizes ranging from small to large (mixed). The evidence is strongest for adults with type 2 diabetes or metabolic syndrome. Doses ranged from 200 to 4600 mg/day, but no clear optimal dose emerged.

  • Studied populations: Adults with type 2 diabetes or metabolic syndrome

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Most studies did not report study duration, and the median duration among those that did was only 7 days, so long-term effects are unclear. Doses varied widely (200-4600 mg/day), making it difficult to recommend a specific dose.

Generated Jul 4, 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 7 studies
7 of 7 papers
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