Overview
About Black seed
Black seed is Nigella sativa, the small matte-black seed scattered over naan and Turkish bread and stirred into Bengali panch phoron.
As a spice it grades clean across the board here, with no histamine, no tyramine, no free glutamate, no sulfites, no salicylate flag and no FODMAP load. The reason it needs a page at all is that most people meeting it now are not meeting a spice. They are taking black seed oil capsules or a spoon of cold-pressed oil standardised for thymoquinone, and that is a daily dose orders of magnitude larger than anything you would sprinkle on bread. Almost every reported side effect and drug interaction belongs to the supplement, not the seed.
Sensitivities
How Black seed scores
Watch for
What trips people up
- The culinary dose and the supplement dose are not the same exposure. A pinch of seed on flatbread is a fraction of a gram, while black seed oil regimens run one to three grams a day standardised for thymoquinone, the compound that makes up roughly half a percent to two percent of the oil. If you started a supplement, log it as a supplement.
- At supplement doses the common complaints are gastric: bloating, nausea, loose stools and reflux. These read exactly like a new food intolerance in a diary, so a black seed oil start date is worth marking before you go hunting through your meals.
- Thymoquinone interacts with cytochrome P450 enzymes including CYP2C9, the pathway that clears warfarin, and trials consistently show modest blood-sugar and blood-pressure lowering. Stacked with an anticoagulant, a diabetes drug or a blood-pressure medication, the effects add up. Clear a black seed oil habit with whoever manages your prescriptions.
- Rash and skin hypersensitivity are the recurring non-gut reports, and contact dermatitis from black seed oil applied to skin is documented. Nigella sativa is unrelated to true cumin despite the shared name, so a cumin allergy tells you nothing about it.
- As a whole spice it grades clean on histamine, gluten, lactose, nickel, sulfites, nightshades and all FODMAP subgroups, which makes it one of the easier ways to add flavour on a restricted diet.
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Black seed
Is black seed the same as black cumin?
The names are used interchangeably and both usually mean Nigella sativa, also sold as kalonji or black caraway. It is not true cumin and not caraway, which are both in the carrot family, while nigella is in the buttercup family. Our black cumin seed entry grades salicylates high while this black seed entry grades them clean, so if you are on a salicylate elimination treat the stricter of the two as your working assumption until you have tested it yourself.
Is black seed oil a trigger for gut symptoms?
It can be, in a way the spice is not. The reported side effects of black seed oil at supplement doses are mostly gastrointestinal: bloating, nausea, diarrhoea and reflux, and they show up within days of starting. Because people usually start an oil alongside other diet changes, it often gets blamed on food. Log the supplement as its own entry and pause it for two weeks if the pattern is unclear.
Does black seed interact with medication?
Its main active compound, thymoquinone, affects cytochrome P450 enzymes including CYP2C9, which handles warfarin, so a food-drug interaction is plausible rather than theoretical. Clinical trials also show black seed nudging blood glucose, blood pressure and lipids downward, so it can compound the effect of diabetes and blood-pressure drugs. The spice on your bread is not the concern here. The capsules are.
Is black seed safe on a low-histamine or low-FODMAP diet?
The seed itself is. It grades clean on histamine, histamine liberation, tyramine and every FODMAP subgroup, so it is a useful seasoning when your options have narrowed. What it will not do is stay clean once it is a concentrated daily oil, where the dose and the effects are a different question entirely.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.