Black Seed Oil UK — Thymoquinone, Extraction & How to Read the Label
Black seed oil, and the number nobody prints.
Every black seed oil bottle shouts a milligram figure. Almost none states the one measurement that actually separates a good oil from a weak one — and once you know what it is, the whole category reads differently.
Black seed oil UK — summary
Black seed oil is pressed from the seeds of Nigella sativa, a flowering plant in the Ranunculaceae or buttercup family, known variously as black cumin, kalonji, black caraway and habbatus sauda. The compound of interest is thymoquinone, which typically represents somewhere between roughly 0.2 and 2 percent of the oil depending on seed origin, growing conditions, storage and extraction method. Because of this, a milligram figure on a black seed oil label describes the total quantity of oil rather than the thymoquinone content, and two products both stating 1000mg can differ considerably in thymoquinone. Cold pressing uses mechanical pressure without added heat or chemical solvents. Solvent extraction uses chemical solvents, typically yields more oil and costs less. Black seed oil differs from ground black seed powder, which is milled whole seed containing far less oil by weight. Nigella sativa is not related to black sesame despite a similar appearance, nor to cumin proper. Vitality Supplements sells Black Seed Oil at 1000mg per serving in softgel capsules for GBP 14.99, manufactured in the United Kingdom. There are no authorised UK or EU health claims on Nigella sativa or thymoquinone.
What black seed actually is.
Black seed oil is pressed from the seeds of Nigella sativa, a small flowering plant in the buttercup family native to South and West Asia and the Mediterranean. The seeds have been used in cooking and traditional practice across the Middle East, North Africa and South Asia for a very long time.
It goes by a lot of names, which is part of why the category is confusing to shop: black cumin, kalonji, black caraway, nigella, habbatus sauda and habba sawda all refer to the same plant.
What it is not
Two common mix-ups worth clearing up. It is not black sesame — the seeds look similar but are unrelated plants. And it is not cumin, despite "black cumin" being one of its names; true cumin is Cuminum cyminum, a different species in a different family.
Thymoquinone is the measurement that matters.
Thymoquinone — often shortened to TQ — is the compound in black seed oil that research has focused on. It is what makes the oil interesting as a supplement rather than simply as a cooking ingredient.
Here is the part almost no label tells you. Thymoquinone typically makes up only a small fraction of the oil — published analyses put it somewhere in the region of 0.2% to 2%, and the variation between samples is genuinely large. It depends on where the seeds were grown, the growing conditions that season, how the seeds were stored and how the oil was extracted.
So "1000mg of black seed oil" tells you the quantity of oil, not the quantity of thymoquinone. Two products both stating 1000mg can differ several-fold in the compound you are buying it for. A higher milligram figure on the front of a bottle is not evidence of a stronger product.
If a brand states a standardised thymoquinone percentage, that is more informative than the oil weight. Most do not — including, at present, ours. We would rather tell you that than let the milligram number imply something it does not.
This is the same trap that runs through several supplement categories: alpha lipoic acid, quercetin and berberine all have front-of-pack numbers that mean less than they appear to.
Cold-pressed vs solvent-extracted.
How the oil is separated from the seed affects both what ends up in the bottle and what it costs.
Cold pressing
Mechanical pressure, no added heat and no chemical solvents. Yields less oil per kilo of seed, which makes it more expensive. Because thymoquinone is sensitive to heat and light, cold pressing is generally the preferred method for this particular oil.
Solvent extraction
Chemical solvents pull more oil out of the same seed, so it is cheaper and higher-yielding. The solvent is removed afterwards, but the process involves more heat and handling.
Storage matters too. Black seed oil degrades with exposure to light, heat and air — which is why it is usually sold in dark glass or in softgels rather than clear bottles.
Oil, seed powder, or liquid.
Three things are sold under the black seed heading, and they are not interchangeable.
| Format | What it is | Worth knowing |
|---|---|---|
| Black seed oil softgels | Pressed oil enclosed in a capsule | No taste, dose is consistent, oil is protected from light and air |
| Liquid black seed oil | Pressed oil sold in a bottle | Strong, peppery, bitter taste. Degrades faster once opened |
| Ground black seed powder | The whole milled seed, not the oil | Contains far less oil by weight — a gram of powder is not a gram of oil |
If a product states a milligram figure, check whether it refers to oil or to whole ground seed. The two are not comparable.
1000mg of Nigella sativa seed oil per serving in softgel capsules — no taste, protected from light and air. Manufactured in the United Kingdom and third-party tested.
What to check on any black seed oil.
Applies to any brand, including ours. All of these are matters of labelling and process, not health outcomes.
The terms, defined.
Black seed oil questions.
Written by the Vitality Supplements Editorial Team. We sell a black seed oil, and we say so plainly. This guide is written so you can evaluate any brand's label — including the point that we do not currently state a standardised thymoquinone percentage on ours. We would rather disclose that than let a milligram figure imply a strength it does not describe. We cover composition, extraction and labelling only. There are no authorised UK or EU health claims on Nigella sativa or thymoquinone, so we make none. See our editorial standards.
Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or under medical care, consult a healthcare professional before use. This page is general information, not medical advice, and is not intended to diagnose, treat or prevent any condition. There are no authorised UK or EU health claims on Nigella sativa or thymoquinone, and no medicinal or disease claims are made here. Thymoquinone percentages cited are ranges reported in published compositional analyses and vary by source. Prices correct at the time of publication; live pricing is shown on the product page. UK manufactured. See our full disclaimer.