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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Cinnamon and Reduced Hemoglobin A1c

Research synthesisHigh evidenceModerate effect6 studies · 4 beneficial · 2 neutral · 0 harmful

Across 6 studies, 4 reported beneficial effects of cinnamon on reducing hemoglobin A1c, with 2 neutral findings and no harmful effects. Predominant effect sizes were moderate among beneficial studies, and statistically significant effects were observed in 4 studies. Effects were typically observed in adults with type 2 diabetes, and the median study duration was 57 days; doses of ≤2 g/day showed moderate evidence for HbA1c reduction.

  • Effective dose range: ≤2 g/day
  • Studied populations: adults and the elderly with type 2 diabetes

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). Several studies had small sample sizes or were part of broader comparisons where cinnamon alone was not the primary intervention. Effect sizes varied across meta-analyses (small to moderate), and clinical significance of the reduction may be modest.

Generated Jun 15, 2026
Doses used in studies
  • mg/day: 600 (median 600, IQR 600–600) — 1 study
Time to effect
Median: 8.1 weeks · IQR 6.2 weeks–10.1 weeks · Range 4.3 weeks–2.8 months — Reported in 2 of 6 studies
6 of 6 papers
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