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Evidence-Based Supplement Research
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Anthocyanins and Reduced Hemoglobin A1c

Research synthesisModerate evidenceModerate effect4 studies · 4 beneficial · 0 neutral · 0 harmful

Across 4 studies, all reported beneficial effects, with moderate effect sizes most common. In type 2 diabetes populations, median doses of 320 mg/day were associated with reductions in HbA1c of approximately 0.3–0.5%. Effects were typically observed at 56 days or longer.

  • Effective dose range: 320 mg/day (median)
  • Studied populations: people with type 2 diabetes, mixed populations with cardiometabolic disease

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). Evidence base is small (only 4 studies) — conclusions should be considered preliminary.

Generated Jul 17, 2026
Doses used in studies
  • mg/day: 320 (median 320, IQR 320–320) — 2 studies
Time to effect
Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 4 studies
4 of 4 papers
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