Nigella Sativa (Black Seed Oil)
Seeds and oil from the Nigella sativa plant, also known as black seed, black cumin, or kalonji. Used for centuries in traditional medicine across the Middle East and South Asia. Has genuine — if modest — evidence for weight loss, with effects possibly linked to its anti-inflammatory properties and impact on blood sugar.
Quick read · 3 min
- •Evidence: Moderate — some consistent evidence but with limitations
- •A 2023 network meta-analysis of 111 randomised controlled trials found that nigella sativa produced an average of 2.
- •Generally considered safe at recommended doses.
- •Unlike prescription drugs, supplements are not tested for effectiveness by the FDA before sale
Based on clinical trials · No rankings · Every claim linked to source
Last reviewed: March 2026
How it works
Contains thymoquinone as its main active compound, which has anti-inflammatory and antioxidant properties. Proposed to reduce obesity-related inflammation, improve how your body uses insulin (insulin sensitivity), and modestly reduce appetite. The exact weight loss mechanism is not fully established but may involve multiple pathways.
What the evidence shows
A 2023 network meta-analysis of 111 randomised controlled trials found that nigella sativa produced an average of 2.09 kg more weight loss than placebo — moderate certainty evidence. This is a meaningful and consistent finding relative to many supplements in this review. Effects on blood sugar and cholesterol may be an additional benefit for some people.
Safety
Generally considered safe at recommended doses. May interact with blood-thinning medications (like warfarin) — the active compounds can have mild anticoagulant effects. May also interact with diabetes medications, as it can lower blood sugar. If you take either of these, check with your doctor or pharmacist before using. Avoid at medicinal doses during pregnancy.
Community insights
These are personal experiences shared in public online communities — not medical advice.
“The oil has a distinctive, slightly bitter taste. Capsules are much easier to stick with than straight oil for most people.”
“Popular in South Asian communities for blood sugar management — the evidence there is actually quite good. The weight loss effect seems real but secondary.”
Common questions
After reading this page, most people compare this with other supplements, look at prescription options, or check what they can do today without a prescription.