Legal status · United Kingdom
Is Niacin legal in the United Kingdom?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Niacin can be sold in the United Kingdom as a supplement or cosmetic ingredient, classified as "Available as a supplement; the extended-release niacin plus laropiprant product was withdrawn". 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, 5 human studies are cited on its profile.
Niacin in the United Kingdom at a glance
| Classification | Available as a supplement; the extended-release niacin plus laropiprant product was withdrawn |
|---|---|
| Note | Tredaptive, the niacin-laropiprant combination tested in HPS2-THRIVE, was withdrawn from the market after the trial. |
| MHRA approval status | Not a MHRA drug approval; sold as a supplement or cosmetic |
| Human studies cited | 5 of 6 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Niacin profile, checked against Medicines and Healthcare products Regulatory Agency (MHRA) listings at the reviewed date.
What this means
- 01
Niacin 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 Niacin is
The only compound in the NAD pathway ever tested against hard cardiovascular outcomes, in 25,673 patients in HPS2-THRIVE and 3,414 in AIM-HIGH. It moved every lipid it was supposed to move and prevented no events in either trial, and HPS2-THRIVE found excess serious adverse events including infection and bleeding.
If you want to understand why a moving biomarker is not evidence, this is the compound to study. Nothing else in the longevity supplement world has been tested this thoroughly against outcomes that actually matter, and the answer came back twice.
Mechanism: Nicotinic acid enters NAD synthesis through the Preiss-Handler pathway rather than the NAMPT salvage route, which is why it is a genuinely potent NAD booster and why a 2026 human study proposed that gut bacterial conversion of NR and NMN into nicotinic acid may be how those two expensive precursors work at all. Its lipid effects are separate and act mainly through inhibition of adipocyte lipolysis and hepatic diacylglycerol acyltransferase, reducing free fatty acid flux to the liver and VLDL output.
Regulatory history: Extended-release nicotinic acid is an FDA-approved prescription lipid drug in the United States, though its clinical use collapsed after AIM-HIGH and HPS2-THRIVE. Lower-dose nicotinic acid is also sold over the counter as a supplement. The extended-release niacin with laropiprant combination used in HPS2-THRIVE was withdrawn worldwide after the trial reported.
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 Niacin 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.
Niacin in other countries
United States
ApprovedFDA-approved prescription lipid drug, also sold over the counter as a supplement
Is Niacin legal in the United States?Australia
Not approvedAvailable as a supplement; prescription lipid indication largely abandoned
Is Niacin legal in Australia?Canada
Not approvedPrescription extended-release product historically available; also sold as a supplement
Is Niacin legal in Canada?Frequently asked questions
Is Niacin legal in the United Kingdom?
Niacin can be sold in the United Kingdom as a supplement or cosmetic ingredient, classified as "Available as a supplement; the extended-release niacin plus laropiprant product was withdrawn". 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, 5 human studies are cited on its profile. Note: Tredaptive, the niacin-laropiprant combination tested in HPS2-THRIVE, was withdrawn from the market after the trial.
Can I buy Niacin in the United Kingdom?
Yes, in supplement or cosmetic form. In the United Kingdom Niacin is classified as "Available as a supplement; the extended-release niacin plus laropiprant product was withdrawn", 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: Tredaptive, the niacin-laropiprant combination tested in HPS2-THRIVE, was withdrawn from the market after the trial.
Is Niacin MHRA approved?
No. In the United Kingdom Niacin is classified as "Available as a supplement; the extended-release niacin plus laropiprant product was withdrawn", which is not a MHRA marketing approval. For comparison, the US FDA status is: Extended-release nicotinic acid is an FDA-approved prescription lipid drug in the United States, though its clinical use collapsed after AIM-HIGH and HPS2-THRIVE. Lower-dose nicotinic acid is also sold over the counter as a supplement. The extended-release niacin with laropiprant combination used in HPS2-THRIVE was withdrawn worldwide after the trial reported.. On the evidence, 5 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 Niacin live on its compound profile.
Niacin profileThis page is general information about the regulatory status of Niacin 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.