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Black seed cut fasting blood glucose by 21 mg/dL in a meta-analysis of 16 diabetes trials — but had no effect on insulin, triglycerides, or body weight.
This is the strongest evidence yet that black cumin can meaningfully lower blood sugar in people with type 2 diabetes, but the benefit stops there — it didn't budge other key markers like insulin or weight, so it's not a metabolic cure-all.
A meta-analysis pooling 16 randomized trials found that black seed (Nigella sativa) supplementation lowered fasting blood glucose by an average of 21 mg/dL in people with type 2 diabetes. However, the same analysis showed no significant effect on insulin levels, triglycerides, body weight, or kidney function — meaning the benefit is real but narrow, and likely works through mechanisms other than improving insulin sensitivity or weight loss.
Where this fits in the evidence
Pillser has synthesized 6 studies on Black Cumin for Reduced Fasting Blood Glucose Levels — overall evidence strength: High.
Across 6 studies, 5 reported beneficial effects of black cumin supplementation on fasting blood glucose levels, with effect sizes ranging from small to large (predominantly moderate-to-large). The highest-quality evidence, a 2025 meta-analysis of 82 RCTs involving 5,026 participants, found significant improvements in fasting blood sugar with doses from 200 to 4600 mg/day over a median study duration of 7 days. Effects were most pronounced in adults with type 2 diabetes or metabolic syndrome.
The study
- Meta-Analysis
- 2025-04-08
- Complementary therapies in medicine
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.