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Black Cumin

What does the research say about Black Cumin?

21 health outcomes synthesised

Black Cumin (Nigella sativa) has been studied across 21 health outcomes, with the strongest evidence supporting its effects on reducing fasting blood glucose levels—5 of 6 studies, including a 2025 meta-analysis of 5,026 participants, found moderate-to-large benefits. Doses in research range from 200 to 4,600 mg/day, with effects most consistently observed in adults with type 2 diabetes or metabolic syndrome.

Strongest evidence: High-strength evidence from 6 studies shows moderate-to-large reductions in fasting blood glucose and hemoglobin A1c, primarily in adults with type 2 diabetes or metabolic syndrome, at doses of 200–4,600 mg/day. Similarly, high-strength evidence from 4 studies indicates large effects on reducing total cholesterol. Moderate-strength evidence supports moderate reductions in triglycerides, C-reactive protein, malondialdehyde, tumor necrosis factor alpha, and interleukin-6, as well as small-to-moderate improvements in body weight, body mass index, systolic blood pressure, and total antioxidant capacity.

Mixed or weaker evidence: No outcomes in the top 12 have low or very low evidence strength; however, results for body weight (2 of 5 studies neutral) and body mass index (2 of 5 studies neutral) show mixed effects, with small effect sizes suggesting benefit may not be universal.

Effective dose patterns: Across all outcomes with available dose data, the effective range consistently falls between 200 and 4,600 mg/day. For metabolic outcomes like glucose and lipid reduction, doses on the higher end of this range were more commonly studied in meta-analyses. No specific form (e.g., oil vs. powder) emerged as more effective, as form data were rarely reported.

Population insights: Benefits for glucose, HbA1c, cholesterol, and inflammatory markers were most pronounced in adults with type 2 diabetes or metabolic syndrome. Effects on body weight and blood pressure were observed in populations with metabolic diseases, PCOS, and postmenopausal hypertension. No evidence suggests benefit in healthy, non-clinical populations.

Notable caveats: Publication bias is a recurring concern—null results may be underrepresented. Study durations were often short (median 7–56 days), limiting long-term effect estimates. Individual trial heterogeneity was high (e.g., I²=95.7% for HbA1c), and wide dose ranges without form specification reduce precision for practical guidance.

Frequently asked

  • What is Black Cumin good for according to research?
    Research shows Black Cumin supplementation may help reduce fasting blood glucose and hemoglobin A1c (5 of 6 studies beneficial, high evidence), lower total cholesterol (4 of 4 studies beneficial, high evidence), and reduce inflammatory markers like C-reactive protein and tumor necrosis factor alpha (all 3 studies beneficial, moderate evidence). Effects on body weight and body mass index are mixed and small.
  • What dose of Black Cumin is typically used in studies?
    Across multiple outcomes, studies used doses ranging from 200 to 4,600 mg per day. For metabolic outcomes such as glucose and cholesterol, most meta-analyses reported this broad range. The most commonly studied dose was 2,000 mg per day, though form (e.g., oil versus powder) was rarely specified.
  • Who benefits most from Black Cumin?
    Beneficial effects on blood sugar, cholesterol, and inflammatory markers were most consistently observed in adults with type 2 diabetes or metabolic syndrome. Studies also found benefits for body weight and blood pressure in populations with metabolic diseases, PCOS, and postmenopausal hypertension. No data indicate benefit in healthy individuals without underlying conditions.
  • Are there caveats or limitations in the research on Black Cumin?
    Yes. Publication bias is a major concern—beneficial results are more likely to be published. Study durations were often short (median 7–56 days), making long-term effects unclear. Individual trial heterogeneity was high, and many studies did not report the form of black cumin used, limiting practical dosing guidance.
  • Does Black Cumin help with reducing inflammation?
    Moderate-strength evidence from 3 meta-analyses shows Black Cumin supplementation consistently reduces C-reactive protein, malondialdehyde, tumor necrosis factor alpha, and interleukin-6, with moderate effect sizes. However, the evidence base is small and may be influenced by publication bias.
  • How long does it take for Black Cumin to show effects?
    Reported study durations varied widely, with median durations of 7 days for glucose and lipid outcomes and 56 days for body weight and BMI. This suggests some effects may appear within one week, but longer-term effects beyond 8 weeks remain uncertain due to limited data.

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), Ginger (2), Fenugreek Seed (2), Turmeric (2), Cinnamon (2)

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