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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Big effect

Nigella seed lowered fasting blood sugar by ~19 mg/dL in a meta-analysis of 31 trials — but only for people with metabolic conditions, and the dose wasn't standardized

This is one of the first meta-analyses to pool data on nigella seed for metabolic health, and the blood sugar drop is large enough to be clinically noticeable, though the lack of a fixed dose and the focus on already-sick patients means healthy people shouldn't expect the same effect.

A meta-analysis of 31 trials with over 2,100 people found that nigella seed supplementation reduced fasting blood sugar by about 19 mg/dL on average — a meaningful drop for someone with prediabetes or diabetes. However, the studies didn't use a consistent dose, and the effect was seen only in people with metabolic diseases, not in generally healthy individuals.

Where this fits in the evidence

This is among the first studies we've indexed on nigella seed for Reduced Fasting Blood Glucose Levels — treat it as an early signal until more research accumulates.

The study

The Effect of Nigella sativa Supplementation on Cardiometabolic Health in Patients With Metabolic Diseases: A GRADE-Assessed Systematic Review and Meta-Analysis.

  • Meta-Analysis
  • n = 2,145
  • 2026-03
  • Endocrinology, diabetes & metabolism
More on nigella seedMore on Reduced Fasting Blood Glucose Levels

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.

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