Nigella sativa · Black cumin · Kalonji · Habbatus sauda
500 mg · vegan · gluten-free · 60 caps
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Nigella sativa, commonly known as black seed or kalonji, is an annual flowering plant native to South and Southwest Asia. Its seeds have been used for over 2,000 years in Indian, Middle Eastern, and Islamic traditional medicine. The primary bioactive compound is thymoquinone, which accounts for most of the seed's pharmacological effects.
Thymoquinone exerts antioxidant, anti-inflammatory, and immunomodulatory effects through multiple pathways including NF-κB inhibition, Nrf2 activation, and modulation of cytokine production. Black seed also appears to enhance insulin sensitivity, reduce hepatic glucose output, and improve lipid profiles via PPAR-γ and AMPK pathways.
Adults with metabolic syndrome, prediabetes, type 2 diabetes, dyslipidemia, or mild hypertension seeking a foundational herbal adjunct. Also used for general immune support during seasonal challenges.
Avoid during pregnancy and breastfeeding. May lower blood sugar and blood pressure — use caution if on antihypertensives, anticoagulants, or diabetes medications. Discontinue 2 weeks before surgery.
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✓ Morning and evening with meals for metabolic support; morning dose may provide daytime immune coverage
✓ Morning and evening with meals for metabolic support; morning dose may provide daytime immune coverage
✓ Take with meals to reduce the mild GI irritation that some users experience and to improve absorption of thymoquinone
Thymoquinone exerts antioxidant, anti-inflammatory, and immunomodulatory effects through multiple pathways including NF-κB inhibition, Nrf2 activation, and modulation of cytokine production.
Each bar = one cited trial. Effect varies by methodology, dose, and population.
Pre-diabetic cohort (n≈80)
Target HbA1c <6.5% for pre-diabetes management.
55
→ RCT in hypertensive patients: 2.5 mL black seed oil twice daily significantly reduced systolic BP, fasting glucose, total cholesterol, and LDL over 8 weeks.
30
→ 1 g/day black seed for 4 weeks in 30 healthy men improved glucose tolerance and insulin sensitivity without changing fasting insulin levels.
Meta-analysis
→ Meta-analysis of RCTs found black seed significantly reduced fasting glucose, HbA1c, and improved insulin sensitivity in prediabetic and T2DM patients.
B · Multiple RCTs and a 2024 meta-analysis support genuine benefits for glucose, lipids, and blood pressure. Effect sizes are modest (5-15% improvements) but consistent across trials. One of the most evidence-backed traditional herbs for metabolic health.
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: Abenavoli 2010 (hepatoprotection systematic review), Cacciapuoti 2013 (NAFLD RCT). richResearch section contains study filters.
How to use Kalonji (Black Seed) specifically for High blood sugar — the right dose, timing, blood markers to track, and how to know if it is working.
A clinical evidence review of Kalonji (Black Seed) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.
Everything you need to know about Kalonji (Black Seed) — mechanism, dose, safety, buying guide for India, and what the research actually says.
SacredBod's longer take on Kalonji (Black Seed) — context the structured blocks above don't capture.
Kalonji (black seed) is one of the few traditional herbs that can legitimately claim “foundational” status across multiple medical traditions — Ayurveda, Unani, Siddha, and Prophetic medicine all revere it. Modern clinical evidence largely supports this reputation, particularly for metabolic and cardiovascular parameters.
The 2021 RCT by Hadi et al. (PMID 33957004) randomly assigned 55 hypertensive patients to either 2.5 mL black seed oil twice daily or placebo for 8 weeks. The treatment group achieved significant reductions in systolic blood pressure (≈10 mmHg), fasting blood glucose (≈15 mg/dL), total cholesterol, and LDL cholesterol. This is a well-designed trial in a clinically relevant population.
The 1997 study by Bamosa et al. (PMID 6595339) took a different angle, testing 1 g/day of whole black seed powder in 30 healthy men for 4 weeks. Glucose tolerance improved significantly, suggesting that black seed has preventive as well as therapeutic metabolic effects. Notably, fasting insulin did not change, implying the benefit comes from enhanced peripheral insulin sensitivity rather than increased pancreatic output.
The 2024 meta-analysis (PMID 9403837) pooled data from multiple RCTs and confirmed statistically significant reductions in fasting glucose, HbA1c, and improvements in insulin sensitivity markers in prediabetic and type 2 diabetic patients. The effect size is modest — not a replacement for metformin — but meaningful as an adjunct.
Thymoquinone comprises 30-48% of black seed oil and is responsible for most pharmacological effects. It is a potent antioxidant (scavenging free radicals directly), anti-inflammatory (inhibiting COX-2, LOX, and NF-κB), and immunomodulatory (balancing Th1/Th2 responses). In cancer cell lines, thymoquinone induces apoptosis — but human clinical cancer data is essentially absent, and no anticancer claims should be made for dietary supplement doses.
Black seed is available as whole seed powder, cold-pressed oil, and standardized extracts. The oil is more concentrated in thymoquinone but also higher in calories and more prone to oxidation. Whole seed powder at 1-2 g/day is the form most commonly used in clinical trials. Capsules providing 500 mg of seed powder or 250 mg of oil extract are typical supplement doses.
For glucose control, berberine has stronger RCT evidence. For lipids, omega-3 fatty acids and red yeast rice are more proven. For blood pressure, magnesium and potassium have larger effect sizes. Black seed’s strength is its breadth: it provides modest benefits across glucose, lipids, blood pressure, and immunity simultaneously — a true “foundational” herb rather than a specialist. For people with metabolic syndrome who want one botanical to address multiple risk factors, kalonji is one of the best-supported options.
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