1–3 g/day of ground seed or 200–500 mg of oil standardized to thymoquinone.
Modestly lowers blood pressure: around −3.3 mmHg systolic and −2.8 diastolic in meta-analyses of trials.
View the study (meta-analysis) →Improves lipid profile (lowers total cholesterol, LDL, and triglycerides) in several meta-analyses.
View the study (meta-analysis) →⏱ 3 min read
Black cumin, a plant whose seed and oil have been used for millennia in traditional Arab and Indian medicine for countless ailments, has begun over the past decade to accumulate a serious clinical evidence base that goes far beyond folklore: modern trials describe a metabolic and anti-inflammatory activity profile that overlaps with several areas relevant to healthy aging, especially glycemic control, lipid profile, and blood pressure.
The most studied active principle is thymoquinone, a volatile phenolic compound present in the seed's essential oil, to which most of the antioxidant, anti-inflammatory, and lipid-metabolism-regulating effects observed in preclinical and clinical studies are attributed; the amount of thymoquinone varies widely between commercial products, and standardized oils are those used in the trials with the best results.
The most consistent evidence for black cumin is its effect on lipid profile: several meta-analyses have shown modest but significant reductions in total cholesterol (around 10 percent), LDL (between 8 and 12 percent), and triglycerides (between 5 and 10 percent) with doses of 1 to 3 grams daily of seed powder or the equivalent in oil, over 6 to 12 weeks.
These effects are comparable to those of some mild lipid-lowering agents such as phytosterols or psyllium, and are seen both in people with mild dyslipidemia and in patients with metabolic syndrome, suggesting a relatively universal mechanism that probably combines inhibition of intestinal cholesterol absorption with modulation of hepatic synthesis.
In type 2 diabetes, several randomized trials have shown modest but clinically significant reductions in fasting glucose (10 to 20 mg/dL) and HbA1c (0.3 to 0.5 percent) with 1 to 2 grams daily of seed powder over 8 to 12 weeks; the effect adds to that of standard treatment without generating relevant drug interactions in the available studies.
The mechanism appears to combine improved peripheral insulin sensitivity, modulation of the chronic low-grade inflammation characteristic of diabetes, and possibly direct effects on pancreatic beta-cell function; the size of the effect is smaller than that of metformin but sufficient as a reasonable adjunct in the nutritional management of type 2 diabetes.
On blood pressure, meta-analyses show modest reductions in systolic (3-5 mmHg) and diastolic (2-3 mmHg) pressure in hypertensive people with prolonged use, an effect that, although modest, adds to other dietary interventions at low cost and without adverse effects; in allergic asthma, several small studies suggest symptomatic improvements, and immunomodulatory effects have been explored in viral respiratory infections with promising but still preliminary data.
The doses studied range from 1 to 3 grams daily of seed powder or 500-1,000 milligrams daily of oil standardized to thymoquinone; it is ideally taken with meals to improve absorption and reduce digestive discomfort; clinical effects on metabolic markers appear between 4 and 12 weeks, and it is not a compound with an immediate response.
Generally well tolerated; the most common adverse effects are mild digestive discomfort and, rarely, allergic skin reactions; people taking anticoagulants should use caution because of the theoretical antiplatelet effect, those taking antihypertensives or antidiabetic drugs may need dose adjustment if the effect is notable, and use during pregnancy is not recommended because of insufficient data and a uterotonic effect described in animals.
Information, not medical advice. Scientific evidence reflects the quality of the studies.