Nigella oil is extracted from the seeds of Nigella sativa, a plant native to southwest Asia. It is used by some for the treatment of asthma, diabetes, hypertension, weight loss, and other conditions. One of its key components is thymoquinone, a compound with antioxidant properties.
In many parts of the world, Nigella sativa seeds are used as traditional medicine for obesity, diabetes, and high blood pressure. In some small studies, supplements made with it have shown to lower levels of cholesterol and blood fats called triglycerides.