Can black seed oil lower blood sugar?

Possibly. Randomized trials and meta-analyses suggest Nigella sativa supplementation may improve fasting blood glucose and A1C in people with type 2 diabetes. However, results vary, and black seed oil is not an established diabetes treatment.(( Karimi M, Pirzad S, Pourfaraji SMA, et al. Effects of black seed (Nigella sativa L.) on cardiometabolic indices in type 2 diabetic patients: A systematic review and meta-analysis of RCTs. Complementary Therapies in Medicine.2025;90:103174. PubMed: https://pubmed.ncbi.nlm.nih.gov/40210172/ ))

How much black seed oil should you take for diabetes?

There is no medically established dose of black seed oil for treating diabetes. Clinical studies have used different forms, doses, and treatment durations, so an optimal dose has not been established.(( Shirvani S, Falahatzadeh M, Oveili E, et al. The effect of Nigella sativa supplementation on glycemic status in adults: An updated systematic review and meta-analysis of randomized controlled trials. Prostaglandins & Other Lipid Mediators. 2024;174:106885. PubMed: https://pubmed.ncbi.nlm.nih.gov/39181437/ )) Talk with your healthcare provider before adding a supplement to your diabetes management plan.

Can you take black seed oil with diabetes medication?

Anyone taking insulin or other glucose-lowering medication should discuss black seed oil with their healthcare provider before using it. Because black seed may affect blood glucose, closer glucose monitoring may be appropriate when adding it to an existing treatment plan.

Can black seed oil replace diabetes medication?

No. Black seed oil should not replace prescribed diabetes medication, healthy eating, physical activity, glucose monitoring, or other components of an established diabetes treatment plan. The ADA does not recommend herbal supplements for glycemic benefits.(( American Diabetes Association Professional Practice Committee for Diabetes. 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes—2026. Diabetes Care.2026;49(Suppl. 1):S89–S131. ADA / Diabetes Care: https://diabetesjournals.org/care/article/49/Supplement_1/S89/163932/5-Facilitating-Positive-Health-Behaviors-and-Well ))

Supplements

Supplements | T2D

Black Seed Oil and Diabetes: Benefits, Research and How to Use It
ByLaura Henry January 31, 2023August 18, 2026

Read More Black Seed Oil and Diabetes: Benefits, Research and How to Use It