Black seed, when taken by mouth in small quantities, such as a flavoring for foods, is likely safe for most people. Black seed oil and black seed extract are possibly safe when medical amounts are used short-term. There is not enough information to know if larger, medicinal quantities are safe. Black seed can cause allergic rashes when applied to the skin.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Black seed seems to be safe in food amounts during pregnancy. But taking larger medicinal amounts is likely unsafe. Black seed can slow down or stop the uterus from contracting.
Not much is known about the safety of using black seed during breast-feeding. Stay on the safe side and avoid use.
Children: Black seed oil is possibly unsafe for children when taken by mouth short-term and in recommended amounts.
Bleeding disorders: Black seed might slow blood clotting and increase the risk of bleeding. In theory, black seed might make bleeding disorders worse.
Diabetes: Black seed might lower blood sugar levels in some people. Watch for signs of low blood sugar (hypoglycemia) and monitor your blood sugar carefully if you have diabetes and use black seed.
Low blood pressure: Black seed might lower blood pressure. In theory, taking black seed might make blood pressure become too low in people with low blood pressure.
Surgery: Black seed might slow blood clotting, reduce blood sugar, and increase sleepiness in some people. In theory, black seed might increase the risk for bleeding and interfere with blood sugar control and anesthesia during and after surgical procedures. Stop using black seed at least two weeks before a scheduled surgery.