Black seed / Kalonji (Nigella sativa) has been used in traditional medicine across South Asia and the Middle East. A major 2025 study — analysing 16 clinical trials involving over 1,200 diabetic patients — now confirms several of those benefits are real.
What can black seed do for type 2 diabetics?
Lower blood sugar. Patients taking black seed saw fasting blood sugar drop by over 21 points on average. Their 3-month average sugar control (HbA1c) also improved — a sign of sustained, not just short-term, benefit.
Improve cholesterol. Total cholesterol fell by nearly 19 points and "bad" LDL cholesterol by nearly 20 points — reductions in the same range as some medications.
How to get the most out of it
- Use the oil, not the powder. The oil form consistently produced better results.
- Take more than 1 gram daily. Lower doses showed weaker effects.
- Blood sugar benefits took longer than 8 weeks to appear. Consistency matters.
The bottom line
Black seed oil, taken daily at a meaningful dose, can lower blood sugar and cholesterol in people with type 2 diabetes.
It works best as an addition to a proper diet — not a replacement for it.
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