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what-is-trigonelline
What is Trigonelline?
Trigonelline explained from the ground up — what the compound is, its chemistry as a methylated form of niacin, where it occurs in fenugreek and coffee, its place in the NAD+ family, and why the dose and the pure crystalline form matter when you read a label.
Last updated June 2026 · Written by Vitality Supplements Editorial Team · ~2,100 words · 9 min read
Food supplement information — not medical advice
UK manufactured
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Quick answer
What is trigonelline?
Trigonelline is a naturally occurring plant alkaloid — chemically, the methylbetaine of nicotinic acid, which is a methylated form of niacin (vitamin B3). It is found in fenugreek seeds and in coffee beans, with notably higher levels in green, unroasted coffee because roasting degrades it. It sits within the broader vitamin B3 / NAD+ family of molecules and has been examined in research in relation to NAD+ metabolism. As a supplement ingredient it is supplied as an isolated, high-purity crystalline powder, rather than buried inside a plant extract. Trigonelline is a food supplement in the UK with no authorised health claims.
Key takeaways
- Trigonelline is a plant alkaloid — the methylbetaine of nicotinic acid (a methylated form of niacin, B3).
- It occurs in fenugreek seeds and coffee; green, unroasted coffee contains more than roasted.
- It sits within the vitamin B3 / NAD+ family and has been examined in NAD+ research — an association, not a promised outcome.
- Supplement-grade trigonelline is supplied as a pure crystalline powder, not an extract.
- Dietary amounts are low and variable — which is why it is isolated and standardised.
- It is a UK food supplement with no authorised health claims.
The basics
What trigonelline actually is
Trigonelline belongs to a family of plant compounds called alkaloids — nitrogen-containing molecules that plants produce naturally. Its identity is precise: it is the methylbetaine of nicotinic acid. In plainer terms, it is a methylated derivative of niacin (vitamin B3), carrying a permanent positive charge on its nitrogen, which is why it exists as an internal salt — a "betaine".
The plant it is named after is fenugreek (Trigonella foenum-graecum), a culinary and traditional ingredient used for centuries. In isolated form trigonelline presents as a white-to-off-white crystalline powder. That crystalline structure is one of the things that separates a purified ingredient from a botanical extract — and it is the reason "pure crystalline form" appears on labels, a point we unpack in Dose, form & honesty.
A precise molecule with a precise name: the methylbetaine of nicotinic acid.
The chemistry & the research
Trigonelline and the NAD+ family
Because trigonelline is a methylated form of nicotinic acid, it sits within the broader vitamin B3 / NAD+ family of molecules — the same biochemical neighbourhood as niacin, nicotinamide and related compounds. That is a statement about chemistry and classification, not about any effect.
Trigonelline is one of the molecules researchers have examined in the context of NAD+ metabolism. To be clear about what that means: it indicates that scientific investigation exists, not that any benefit has been established or authorised. In 2023, work on trigonelline in relation to the NAD+ pathway was published in Nature Metabolism. We reference the existence and the year of that research; we do not extrapolate from it to a claim, because — like the rest of the field — trigonelline carries no authorised UK health claims.
An alkaloid
What it is. A naturally occurring, nitrogen-containing plant compound — the methylbetaine of nicotinic acid.
The B3 family
Where it sits. A methylated form of niacin (vitamin B3), placing it in the broader B3 / NAD+ family of molecules.
A research association
What's studied. Examined in relation to NAD+ metabolism (e.g. Nature Metabolism, 2023). Research describes associations, not outcomes.
Not a medicine
A food supplement. Trigonelline is sold as a food supplement in the UK and carries no authorised health claims.
Where it occurs
Fenugreek, coffee & the roast effect
Trigonelline is not exotic — most people consume small amounts without thinking about it. Two everyday sources dominate. The first is fenugreek seeds, the seed of the plant trigonelline is named after. The second is coffee beans, where trigonelline is one of the characteristic compounds — but with an important twist: green, unroasted beans contain considerably more than roasted beans, because the heat of roasting breaks trigonelline down. The amount in your cup therefore depends heavily on how the coffee was processed.
The practical point is about concentration. Trigonelline occurs in these foods at modest, variable levels — which is exactly why supplement-grade trigonelline is isolated and standardised rather than relied upon from diet alone.
Roast the bean and the trigonelline breaks down — diet is an unpredictable source.
Alkaloid
Compound classMethylbetaine of nicotinic acid (methylated niacin).
C₇H₇NO₂
Molecular formulaVerify against your CoA before relying on it.
Fenugreek
Namesake sourceFrom Trigonella foenum-graecum, plus coffee.
Green > roast
The roast effectRoasting degrades trigonelline; green coffee has more.
- Fenugreek seeds — the namesake source; a long-standing culinary and traditional ingredient.
- Coffee beans — a characteristic coffee compound, highest in green, unroasted beans.
- The roast caveat — roasting breaks trigonelline down, so the amount in roasted coffee is lower and variable.
- The concentration caveat — dietary levels are modest and variable, which is why supplement-grade trigonelline is isolated.
This is the important bit
Why dose & pure form matter
If trigonelline is already in coffee and fenugreek, why isolate it? The answer is amount and consistency. The level in a food depends on the plant, the variety, the growing conditions and — for coffee — how much it was roasted. That makes the dose from diet unpredictable. An isolated, crystalline ingredient lets a known quantity be measured per serving, which is the only honest basis for comparing one product against another.
"Pure form" matters for the same reason. A fenugreek or green-coffee extract contains trigonelline alongside everything else in the plant, often at a small percentage. Pure crystalline trigonelline is the isolated compound at high purity. Two labels can both say "trigonelline" and deliver very different actual amounts of it — which is the entire subject of the next guide.
Same word on the label, very different amounts inside the capsule.
Common questions
Trigonelline FAQ
No — they are related but distinct. Trigonelline is a methylated derivative of nicotinic acid (one form of vitamin B3). The added methyl group changes the molecule's identity and behaviour, so trigonelline is its own compound rather than a form of the vitamin.
Yes — coffee is one of the better-known dietary sources. However, the amount varies a great deal with roast level: green, unroasted beans contain more, because roasting degrades trigonelline. The figure in any given cup is therefore highly variable.
Trigonelline sits within the vitamin B3 / NAD+ family of molecules and has been examined in research in relation to NAD+ metabolism, including work published in Nature Metabolism in 2023. That reflects an active area of investigation — an association studied in research — not an established or authorised effect. No health claims are authorised for trigonelline in the UK.
It refers to the isolated compound supplied as a high-purity crystalline powder, as opposed to trigonelline present at a low percentage inside a fenugreek or green-coffee extract. We cover how to read this on a label in Dose, form & honesty.
No. Trigonelline does not carry authorised health claims in the UK or EU. That is why this guide describes the compound and its sources rather than asserting any effect. The honest regulatory position is explained in Dose, form & honesty.
Because dietary amounts are modest and highly variable — depending on the plant, the variety and, for coffee, the roast. An isolated crystalline ingredient provides a known, consistent quantity per serving, which diet alone cannot reliably do. Because it is a food supplement with no authorised health claims, anyone pregnant, breastfeeding or taking medication should consult a qualified healthcare professional first.
Dose & form, honestly
Now you know what trigonelline is — the next guide is about reading a label straight: the regulatory position, what "pure crystalline form" means, and how to compare products fairly.
Continue reading
About the author. This guide was written and reviewed by the Vitality Supplements Editorial Team, a UK supplement manufacturer. Every batch we produce is independently tested by an ISO/IEC 17025-accredited laboratory, with a Certificate of Analysis available on request.
This article is for general information about food supplements and is not medical advice. Trigonelline is sold as a food supplement in the UK and carries no authorised health claims. Always consult a qualified healthcare professional before starting any supplement, particularly if you are pregnant, breastfeeding, taking medication or managing a health condition. References available on our research references page.
