In one 8-week study, 90 women ages 25–50 with obesity were given a low calorie diet and either a placebo or 1 gram of black seed oil per meal for a total of 3 grams per day (21Trusted Source).
At the end of the study, those taking the black seed oil had lost significantly more weight and waist circumference than the placebo group. The oil group also experienced significant improvements in triglyceride and LDL (bad) cholesterol levels (21Trusted Source).
Despite these promising results, more research is needed on the long-term safety and efficacy of taking black seed oil forweight loss.
May lower blood sugar levels
For individuals with diabetes, consistently high blood sugar levels have been shown to increase the risk of future complications, including kidney disease, eye disease, and stroke (22Trusted Source).
Several studies in individuals with type 2 diabetes indicate that a dose of 2 grams per day of crushed whole black seeds may significantly reduce fasting blood sugar levels and hemoglobin A1c (HbA1c) levels, a measure of average blood sugar levels over 2–3 months (23Trusted Source,24Trusted Source,25Trusted Source).
One study in 99 adults with type 2 diabetes found that both 1/3 teaspoon (1.5 mL) and 3/5 teaspoon (3 mL) per day of black seed oil for 20 days significantly reduced HbA1c levels, compared with a placebo (26).
May help lower blood pressure and cholesterol levels
Black seed oil has also been studied for its potential effectiveness in reducing blood pressure andcholesterol levels.
High blood pressure and high total and LDL (bad) cholesterol levels are important risk factors for heart disease (27Trusted Source).
Two studies, one in 90 women with obesity and the other in 72 adults with type 2 diabetes, found that taking 2–3 grams of black seed oil capsules per day for 8–12 weeks significantly reduced LDL (bad) and total cholesterol levels (21Trusted Source,28).
Another study in 90 people with high cholesterol levels observed that consuming 2 teaspoons (10 grams) of black seed oil after eating breakfast for 6 weeks significantly reduced LDL (bad) cholesterol levels (29).
Antifungal.Black seed oil has also been shown to have antifungal activities. In particular, it may protect againstCandida albicans, which is a yeast that can lead to candidiasis (46Trusted Source,47Trusted Source).
While early research shows promise in the applications of black seed oil, more studies in humans are needed to confirm these effects and the optimal dosage.
Black seed oil is high in antioxidants and may have several benefits for health. These include the treatment of asthma and various skin conditions, lowering blood sugar and cholesterol levels, aiding in weight loss, and protecting brain health.