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

Across 3 meta-analyses, 2 out of 3 studies reported beneficial effects on fasting blood glucose, with effect sizes ranging from small to large. The most robust meta-analysis (2025, n=5026, evidence score 7) found a moderate beneficial effect with doses from 200 to 4600 mg/day. Evidence primarily comes from type 2 diabetes patients, and the median study duration across reported studies was only 7 days, which is short for assessing glycemic changes.

  • Effective dose range: 200 to 4600 mg/day
  • Studied populations: type 2 diabetes patients

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. All three studies are meta-analyses, but the lowest-quality study (evidence score 5) reported a neutral effect size despite a statistically significant excerpt, indicating possible inconsistency. Median study duration is only 7 days, which is insufficient to assess long-term glycemic control; effects observed may not persist. 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).

Generated May 17, 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
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