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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Black Cumin and Reduced Hemoglobin A1c

Research synthesisModerate evidenceModerate effect3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 meta-analyses, 2 reported beneficial moderate-sized effects of black cumin supplementation on reducing hemoglobin A1c in people with type 2 diabetes, while 1 found a neutral small effect. The evidence is preliminary due to the small number of studies and limited reporting of dose and duration; the only reported median study duration was 7 days, which is insufficient for HbA1c changes.

  • Studied populations: people with type 2 diabetes

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. The only reported study duration was 7 days, which is too short to observe meaningful HbA1c changes; typical interventions require 8-12 weeks. Dosing information was sparse, with only one study reporting a wide dose range (200-4600 mg/day).

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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