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

Research synthesisHigh evidenceModerate effect6 studies · 5 beneficial · 1 neutral · 0 harmful

Across 6 studies, 5 reported beneficial effects of black cumin supplementation on fasting blood glucose levels, with effect sizes ranging from small to large (predominantly moderate-to-large). The highest-quality evidence, a 2025 meta-analysis of 82 RCTs involving 5,026 participants, found significant improvements in fasting blood sugar with doses from 200 to 4600 mg/day over a median study duration of 7 days. Effects were most pronounced in adults with type 2 diabetes or metabolic syndrome.

  • Effective dose range: 200-4600 mg/day
  • Studied populations: adults with type 2 diabetes, patients with 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). Study durations were very short (median 7 days, reported in only 1 of 6 studies), so long-term effects and optimal dosing duration remain unclear. The wide dose range and lack of form data across studies limit precision of dosing recommendations.

Generated Jun 10, 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 6 studies
6 of 6 papers
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