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Evidence-Based Supplement Research
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Cinnamon and Reduced Fasting Blood Glucose Levels

Research synthesisHigh evidenceMixed effect size5 studies · 4 beneficial · 1 neutral · 0 harmful

Across 5 studies, 4 reported beneficial effects of cinnamon on reducing fasting blood glucose, with effect sizes ranging from moderate to large. The median study duration was 57 days (approximately 8 weeks), suggesting effects are typically observed at 8 weeks or longer. The most studied population is adults with type 2 diabetes, though doses varied widely (≤2 g/day to 600 mg/day) and were not consistently reported.

  • Studied populations: people with type 2 diabetes

Caveats: One neutral meta-analysis (2024) did not find a significant effect, indicating possible heterogeneity. Most studies were meta-analyses that included multiple interventions (e.g., berberine, other herbs), so the isolated effect of cinnamon may be smaller than reported. High heterogeneity was noted in one meta-analysis (I²=88%). Only 2 of 5 studies reported duration, limiting confidence in long-term outcomes.

Generated Jul 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 5 studies
5 of 5 papers
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