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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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brown rice and Reduced Hemoglobin A1c

Research synthesisLow evidenceSmall effect3 studies · 1 beneficial · 2 neutral · 0 harmful

Across 3 studies, 1 reported a small beneficial effect on HbA1c in overweight adults with prediabetes or type 2 diabetes, while 2 found no significant effect. The predominant effect size is small, and effects were typically observed at study durations of 8-12 weeks. No specific dose or form was consistently reported.

  • Studied populations: overweight adults (BMI ≥25 kg/m2) with prediabetes or type 2 diabetes

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. The only statistically significant benefit was observed in a subgroup of overweight participants in a single RCT, while two larger studies (including a meta-analysis) found no effect. Many of the included studies did not reach statistical significance, suggesting the effect may be smaller than the predominant direction implies.

Generated Jul 10, 2026
Time to effect
Median: 10.4 weeks · IQR 9.2 weeks–11.6 weeks · Range 8 weeks–3 months — Reported in 2 of 3 studies
3 of 3 papers
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