Legal status · United Kingdom
Is Nicotinamide legal in the United Kingdom?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Nicotinamide can be sold in the United Kingdom as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: MHRA has not evaluated any health claim, and injectable or "research use only" versions fall outside supplement rules, so that label does not make human use lawful. On the evidence, 4 human studies are cited on its profile.
Nicotinamide in the United Kingdom at a glance
| Classification | Sold as a supplement |
|---|---|
| Note | Sold as a supplement and used as a cosmetic ingredient. No licensed chemoprevention indication. |
| MHRA approval status | Not a MHRA drug approval; sold as a supplement or cosmetic |
| Human studies cited | 4 of 5 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Nicotinamide profile, checked against Medicines and Healthcare products Regulatory Agency (MHRA) listings at the reviewed date.
What this means
- 01
Nicotinamide can be sold in the United Kingdom as a supplement, food or cosmetic ingredient under the classification above, without drug approval.
- 02
Supplement status means MHRA has not evaluated any health claim; manufacturers are responsible for safety and labeling, and quality varies by product.
- 03
Injectable or "research use only" versions are not supplements. That label does not make human use lawful, and injectables fall under medicines rules.
What Nicotinamide is
In the ONTRAC phase 3 trial, 500 mg twice daily cut the rate of new non-melanoma skin cancers by 23 percent over 12 months in 386 high-risk patients, with no benefit once the tablets stopped. The identical trial in 158 organ transplant recipients found nothing, and no trial has ever tested nicotinamide against an ageing outcome.
Nicotinamide is the cheapest thing in this entire category and it is the only NAD-pathway compound with a positive phase 3 result on a clinical endpoint a patient would notice. That result is about skin cancer, not ageing, and the distinction matters more than anything else on this page.
Mechanism: Nicotinamide enters NAD synthesis through the salvage pathway. NAMPT, nicotinamide phosphoribosyltransferase, converts it to NMN, and NMNAT enzymes convert NMN to NAD.
Regulatory history: Not an approved drug for skin cancer prevention in the United States. It is a recognised form of the vitamin niacin, sold over the counter, and included in multivitamins and topical cosmetics. The ONTRAC dose is an over-the-counter dose used off-label.
How MHRA treats this kind of product
Licenses medicines for the UK market. A compound without a marketing authorisation is an unlicensed medicine, which can only lawfully be supplied for human use through a prescriber under the specials scheme, not sold as a research product.
The classification above is the The Longevity Archive reading of Medicines and Healthcare products Regulatory Agency listings for Nicotinamide at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.
Nicotinamide in other countries
Frequently asked questions
Is Nicotinamide legal in the United Kingdom?
Nicotinamide can be sold in the United Kingdom as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: MHRA has not evaluated any health claim, and injectable or "research use only" versions fall outside supplement rules, so that label does not make human use lawful. On the evidence, 4 human studies are cited on its profile. Note: Sold as a supplement and used as a cosmetic ingredient. No licensed chemoprevention indication.
Can I buy Nicotinamide in the United Kingdom?
Yes, in supplement or cosmetic form. In the United Kingdom Nicotinamide is classified as "Sold as a supplement", so oral, topical or cosmetic products can be sold under supplement rules. Injectable versions and products labeled "research use only" are not supplements and are not approved for human use. Note: Sold as a supplement and used as a cosmetic ingredient. No licensed chemoprevention indication.
Is Nicotinamide MHRA approved?
No. In the United Kingdom Nicotinamide is classified as "Sold as a supplement", which is not a MHRA marketing approval. For comparison, the US FDA status is: Not an approved drug for skin cancer prevention in the United States. It is a recognised form of the vitamin niacin, sold over the counter, and included in multivitamins and topical cosmetics. The ONTRAC dose is an over-the-counter dose used off-label.. On the evidence, 4 human studies are cited on its profile.
Related compounds in the United Kingdom
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for Nicotinamide live on its compound profile.
Nicotinamide profileThis page is general information about the regulatory status of Nicotinamide in the United Kingdom, current as of Sep 2026. It is not legal advice, and classifications change; check Medicines and Healthcare products Regulatory Agency directly or consult a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships and does not recommend where to buy anything.