Black cumin
Quick Facts
- What it is: The peppery black seed of Nigella sativa, known in Europe as Schwarzkümmel, used as a spice and a folk remedy.
- Main uses: Mildly raised blood pressure, Blood sugar support in type 2 diabetes, Raised cholesterol, Nasal allergy symptoms, Bloating and wind
- Active ingredients: Thymoquinone, Thymohydroquinone, Dithymoquinone (nigellone), p-Cymene, Carvacrol, Alpha-hederin, Linoleic and oleic acid
- Forms: Whole seed, Ground seed, Cold-pressed oil, Oil capsules, Oil with honey, Skin and hair oils
- Time to effect: Weeks, if anything at all
- Side effects: Usually mild stomach upset and aftertaste; rash and allergy are possible.
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What is Black cumin?
Black cumin is the small black seed of Nigella sativa, a flowering plant in the buttercup family. In German-speaking Europe it is known as Schwarzkümmel. It is both a kitchen spice and an old folk remedy.
It is not the same plant as cumin, caraway or fennel, despite the shared name. The seed is peppery and slightly bitter. It has long been baked onto bread and stirred into cheese and pickles.
Today most people meet it as a cold-pressed seed oil or an oil capsule. Folk use in Europe covered coughs, wind and bloating, worms, and sore skin. Modern marketing often adds blood sugar, cholesterol and allergy claims.
Here is the honest verdict. Human trials exist, but they are small, short and mixed in quality. They hint at small effects on blood pressure, blood sugar and cholesterol.
Nothing in that evidence shows black cumin treats or cures a disease. Long traditional use is not proof that a remedy works. It is also not proof that it is safe.
As a spice on food it is treated as an ordinary food. The concentrated oil and capsules are a different matter. They are far stronger than a sprinkle on bread, and that is where most of the cautions sit.
How does Black cumin work?
No one has shown exactly how black cumin acts in the human body. Most of what you read about it comes from lab dishes and animal work.
The seed oil contains thymoquinone, the compound that gets the most study. In cell studies, thymoquinone appears to lower markers of inflammation. In test tubes it also acts as an antioxidant.
In rodents, black cumin extracts appear to lower blood sugar and blood fats. Some animal work suggests the oil relaxes airway muscle. Whether any of this happens in people at normal doses is not established.
A few small human trials report small drops in blood pressure. The reason is not clear. One idea, drawn from animal studies, is a mild diuretic (water-losing) effect.
Lab tests show the oil slows the growth of some bacteria and fungi. That is a dish, not a person. Do not rely on it to treat an infection.
There is also lab evidence that thymoquinone blocks liver enzymes that break down medicines. It has not been measured properly in people.
That is the basis for the drug warnings further down this page. Those warnings include antiplatelet (anti-clotting) medicines.
In short, the mechanism story is mostly early lab work. It explains why researchers keep testing the seed. It does not tell you what will happen if you take it.
What forms does Black cumin come in?
The common forms, from mildest to strongest:
- Whole seeds, a spice for bread, cheese and vegetables - Ground seed, stirred into food or taken as powder - Cold-pressed seed oil, sold in dark bottles, by the teaspoon - Softgel capsules of the oil, the usual supplement - Seed oil blended with honey, a folk preparation - Cosmetic oils, soaps and hair oils for the skin - Essential oil, distilled and very strong
The spice and the oil are not interchangeable. A pinch on bread is food. A teaspoon of pressed oil is a much larger dose of the same compounds.
Treat the essential oil as a separate product. It is far stronger than the pressed seed oil. It is not meant to be swallowed.
The pressed oil goes rancid. Keep it cool, dark and tightly closed, and go by the bottle's date. A sharp, stale smell means throw it out.
Where it comes from:
European folk practice knew the seed as Schwarzkümmel and used it mainly for the gut and the chest. Country healers gave it for wind, colic and sluggish digestion. It was also a traditional remedy for intestinal worms.
The written trail runs back to Greek and Roman writers. Dioscorides described the seed, called melanthion, for headache, a blocked nose and toothache. Pliny mentioned it too, and those texts fed later European herbals.
In German-speaking regions it was baked onto bread and kept in the kitchen rather than the apothecary. Nursing mothers took it in the belief it helped milk flow. Warmed oil and crushed-seed poultices were laid on sore or itchy skin.
It also carries a strong tradition outside Europe, in Middle Eastern and South Asian medicine. That use is older and wider than the European one. This page covers the European folk strand.
These are records of what people did, not records of what worked. None of it is a reason to self-treat a diagnosed condition.
Who should avoid Black cumin?
- Do not take black cumin oil, capsules or medicinal amounts if you are pregnant. Animal studies suggest it can affect the womb.
- Do not take supplement amounts if you are breastfeeding, because the safety is unknown.
- Do not use it if you take ciclosporin, tacrolimus or other transplant medicines.
- Do not use it alongside warfarin or any other blood thinner unless your doctor agrees.
- Do not start it alongside insulin or diabetes tablets without your doctor, because your blood sugar can drop too low.
- Avoid it in the two weeks before planned surgery, and tell your surgeon you have been taking it.
- Never swallow black cumin essential oil.
- Never put undiluted oil on broken or inflamed skin, and patch test a small area first.
- Do not use it if you have had a reaction to Nigella seeds or to buttercup-family plants.
- Do not give concentrated oil or capsules to children, unless a doctor has told you to.
- Do not use supplement amounts if you have liver disease or kidney disease without medical advice.
- Do not use it instead of prescribed treatment for asthma, diabetes, high blood pressure or infection.
When should you see a doctor?
Stop taking it and see a doctor if you notice any of these:
- A rash, hives, or swelling of the face, lips or tongue - Wheezing or trouble breathing - Yellow skin or eyes, dark urine, or pain under the right ribs - Unusual bruising, nosebleeds, or blood in stools or urine - Repeated dizziness, faintness or shaking, which can mean low blood sugar or low blood pressure - Vomiting or stomach pain that does not settle
Call emergency services for swelling of the throat or real trouble breathing. Do not wait.
Tell your doctor you are taking it before any blood test, surgery or medicine change.
Is Black cumin legal where you live?
In the UK and EU, black cumin is sold as an ordinary food spice and as a food supplement. It is not licensed as a medicine, so it may not be sold as a treatment for any disease. In the United States it is a dietary supplement and is not approved by the FDA to treat anything.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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