Black Seed Oil

Supplements · Immune & Antimicrobial Herbs · Supplement, Typed Supps

A cooking-oil seed studied mostly for blood sugar and blood pressure.

Stage by stage

Intake (Softgel or liquid): Its main active compound, thymoquinone, absorbed alongside dietary fat.
Small intestine (Fat-assisted absorption): Absorbed via the same route as other oil-based compounds.
Bloodstream (Antioxidant activity): Circulates with antioxidant and anti-inflammatory activity.
Blood sugar & immune markers (Studied across many outcomes): Studied for modest effects on blood sugar, cholesterol, and immune markers, across a wide but generally small evidence base.

What the evidence supports

Improving blood-sugar control in type 2 diabetes — moderate evidence. Several randomised trials and meta-analyses report modest reductions in fasting glucose and HbA1c, though studies are mostly small and short.
Lowering blood pressure — limited evidence. Meta-analysis found small average reductions of roughly 3 mmHg systolic; the effect is real but modest and varies by product and dose.

Typical dose

Trials commonly used 1–3 g/day of the oil (or 1–2 g/day of ground seed) over about 8 weeks

Upper limit: No established UL

Timing

With a fat-containing meal.

Time to effect

Weeks: Any reported effect in studies.

Medication interactions

Diabetes medication: May lower blood glucose further, adding to hypoglycaemia risk. (moderate)
Blood-pressure medication: May add to the blood-pressure-lowering effect. (moderate)

Common myth

“Black seed oil is a cure-all with strong evidence for everything it’s marketed for.” In reality: It’s studied for a wide range of outcomes, but most individual studies are small — breadth of claims outpaces depth of evidence for any single one.