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Black Cumin

What does the research say about Black Cumin?

21 health outcomes synthesised

Research on Black Cumin (Nigella sativa) spans 21 health outcomes, with the strongest evidence supporting its ability to reduce fasting blood glucose (7 papers, high evidence) and hemoglobin A1c (6 papers, high evidence) in adults with type 2 diabetes or metabolic syndrome. The most-studied dose range is 200–4600 mg/day, though effects vary by outcome and population.

Strongest evidence: Black cumin shows high-strength evidence for reducing fasting blood glucose (6 of 7 studies beneficial) and hemoglobin A1c (5 of 6 studies beneficial), with moderate effect sizes. For both outcomes, doses ranged from 200–4600 mg/day in populations with type 2 diabetes or metabolic syndrome. Moderate evidence supports small reductions in body weight (4 of 6 studies), body mass index (3 of 5 studies), and systolic/diastolic blood pressure (all 4 studies beneficial). Inflammatory markers like interleukin-6 (4 of 4 studies) and tumor necrosis factor alpha (4 of 4 studies) also show consistent moderate beneficial effects.

Mixed or weaker evidence: Evidence for insulin sensitivity, LDL cholesterol, total cholesterol, and malondialdehyde is moderate but with mixed effect sizes (from small to large). For LDL cholesterol, one meta-analysis in type 2 diabetes patients found no significant effect, suggesting population-specific variation. The limited number of studies (3–4 per outcome) means conclusions remain preliminary for most outcomes beyond glycemic control.

Effective dose patterns: Across outcomes, doses most frequently ranged from 200–4600 mg/day. For inflammatory markers (IL-6), the most-studied range was narrower at 2000–4600 mg/day. No consistent form (oil, powder, extract) was reported across studies, limiting specificity. Study durations were often short (median 7–56 days depending on outcome), so long-term effects are unknown.

Population insights: The strongest effects were seen in adults with type 2 diabetes, metabolic syndrome, or related metabolic disorders for glycemic and weight-related outcomes. For blood pressure and inflammatory markers, effects were observed in diverse populations including postmenopausal women with hypertension and overweight/obese individuals. Evidence in adolescents or general healthy populations is limited.

Notable caveats: A key limitation across all outcomes is potential publication bias — null-result studies are less likely to be published. Most studies did not report specific doses, forms, or durations, and individual trial heterogeneity was often high (e.g., I²=95.7% in one HbA1c analysis). The median study duration was only 7 days for glycemic outcomes, raising questions about long-term efficacy and safety.

Frequently asked

  • What is Black Cumin good for according to research?
    Research shows Black Cumin (Nigella sativa) may help reduce fasting blood glucose (6 of 7 studies beneficial), hemoglobin A1c (5 of 6 studies), and body weight (4 of 6 studies). It also shows consistent benefits for reducing inflammation markers like interleukin-6 and tumor necrosis factor alpha (4 of 4 studies each).
  • What dose of Black Cumin is typically used in studies?
    Studies have used doses ranging from 200 to 4600 mg/day, with no single optimal dose identified across outcomes. For inflammatory markers like interleukin-6, the most common range was 2000–4600 mg/day.
  • Who benefits most from Black Cumin?
    The strongest evidence points to adults with type 2 diabetes or metabolic syndrome for glycemic control (fasting glucose and HbA1c). Blood pressure and weight benefits have also been observed in postmenopausal women with hypertension and people with metabolic diseases.
  • Are there caveats or limitations in the research on Black Cumin?
    Yes. The evidence is subject to publication bias (null-result studies are less likely to be published). Study durations were often short — median 7 days for glycemic outcomes — so long-term effects are unclear. Doses varied widely and most studies did not report the specific form (oil, powder, etc.) used.
  • Does Black Cumin help with hemoglobin A1c?
    Yes, evidence is strong (5 of 6 studies beneficial, high evidence) with moderate effect sizes. A large 2025 meta-analysis of 5,026 participants showed significant reductions. Effects were seen with doses of 200–4600 mg/day in type 2 diabetes and metabolic syndrome patients.
  • Does Black Cumin reduce blood pressure?
    All 4 studies on systolic blood pressure and all 4 on diastolic blood pressure reported small beneficial effects (moderate evidence). Reductions averaged about 3 mmHg systolic and 2.7 mmHg diastolic in metabolic disease populations over 4–8 weeks.

Safety profile

5 studies reporting safety data

Across 5 clinical studies, no specific adverse events were quantitatively reported for Black Cumin (Nigella sativa) extract. The substance was consistently described as well tolerated in all 5 studies, with no significant differences in adverse event rates compared to placebo and no serious adverse events attributed to treatment. Individual study reports noted 'no side effects' and 'no significant complications,' indicating a favorable short-term tolerability profile.

Caveats: Evidence is limited to short-term studies; long-term safety data are lacking. Studies were primarily designed for efficacy endpoints, so rare adverse events may not have been captured, and the absence of reports does not confirm complete safety.

Most-studied combinations with Black Cumin

most supplement research is combination research
Also studied with:Turmeric (4), Shatavari (2), Chasteberry (2), Anise (2), Fenugreek (2), Pennyroyal (2), Vitamin E (2), Ginger (2), Fenugreek Seed (2), Turmeric (2), Cinnamon (2)

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