Herbs

Black seed

Also called: kalonji, nigella sativa, black cumin

Small black seeds (kalonji) and their oil.

Why people take it
Blood sugar, cholesterol, asthma, immunity.
What the evidence says
Some small studies show modest benefits.
How it is usually taken
Usually 1 to 3 g of seed or 500 mg of oil a day.
Be careful
May lower blood sugar and blood pressure; may add to blood thinners.
Medicines it can interact with
May lower blood pressure and sugar with medicines; may slow clotting.

Other herbs

EchinaceaElderberryGarlic extractGingerPeppermint oilMilk thistleSaw palmettoSt John's wortValerianChamomileLemon balmPassionflowerKavaRhodiolaGinkgoMoringaFenugreekCinnamonLicoriceBoswellia

Common questions

What is Black seed?

Small black seeds (kalonji) and their oil.

Why do people take Black seed?

Blood sugar, cholesterol, asthma, immunity.

Does Black seed work?

Some small studies show modest benefits.

How much Black seed do people take?

Usually 1 to 3 g of seed or 500 mg of oil a day.

Is Black seed safe?

May lower blood sugar and blood pressure; may add to blood thinners.

Does Black seed interact with medicines?

May lower blood pressure and sugar with medicines; may slow clotting.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.