Big effect
Turmeric cut HbA1c by 0.31% in a meta-analysis — but only in people with diabetes, and other health markers like blood pressure and weight didn't budge.
A 0.31% drop in average blood sugar over months is a modest but clinically meaningful improvement, though the finding rests on just four small studies with low overall evidence strength, so it's far from a settled recommendation.
This meta-analysis pooled data from four studies and found that curcumin (from turmeric) lowered HbA1c — a measure of long-term blood sugar control — by an average of 0.31% in people with type 2 diabetes or high blood sugar. However, the same analysis found no significant effects on blood pressure, body weight, or kidney markers, and the overall evidence is considered low quality due to the small number of studies and mixed results among them.
Where this fits in the evidence
Pillser has synthesized 4 studies on Turmeric for Reduced Hemoglobin A1c — overall evidence strength: Low.
Across 4 studies, 3 reported beneficial effects (small to moderate) of turmeric/curcumin on reducing Hemoglobin A1c, and 1 study was neutral. The median study duration was 365 days, based on a single high-quality 12-month RCT using 1500 mg/day in adults with type 2 diabetes. Effect sizes were mixed (small to moderate) across studies.
The study
- Meta-Analysis
- 2025-10-17
- Journal of Nepal Health Research Council
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.