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: Moderate.
Across 4 studies, 3 reported beneficial effects of turmeric on reducing hemoglobin A1c, with effect sizes ranging from small to moderate. The strongest evidence comes from a randomized controlled trial using 1500 mg/day for 365 days in adults with type 2 diabetes, which showed a small but statistically significant reduction in HbA1c (6.10% vs. 6.40%). Findings are consistent with meta-analytic data indicating a moderate reduction in HbA1c (e.g., MD = -0.31%), though one systematic review did not find turmeric significantly effective compared to other herbs.
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.