Legal status · United Kingdom
Is Alpha-ketobutyrate legal in the United Kingdom?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Alpha-ketobutyrate 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, 2 human studies are cited on its profile.
Alpha-ketobutyrate in the United Kingdom at a glance
| Classification | Sold as a supplement |
|---|---|
| Note | No licensed medicinal indication; availability as a food supplement is limited. |
| MHRA approval status | Not a MHRA drug approval; sold as a supplement or cosmetic |
| Human studies cited | 2 of 3 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Alpha-ketobutyrate profile, checked against Medicines and Healthcare products Regulatory Agency (MHRA) listings at the reviewed date.
What this means
- 01
Alpha-ketobutyrate 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 Alpha-ketobutyrate is
One lifespan paper, in Caenorhabditis elegans. In humans the closely related metabolite alpha-hydroxybutyrate is not a longevity marker at all: it is an early marker of insulin resistance that predicted worsening glucose tolerance in 3,841 non-diabetic people across two cohorts. No trial of supplementing alpha-ketobutyrate in humans was located.
Alpha-ketobutyrate is sold on the strength of a single well-executed worm paper, and the human data that exist about the same corner of metabolism point in an awkward direction. The worm paper is real and its mechanism is worked out in unusual detail.
Mechanism: Alpha-ketobutyrate sits at the end of the transsulfuration pathway. When cystathionine is cleaved to make cysteine, alpha-ketobutyrate is released as the by-product, so its production rises whenever flux from homocysteine to cysteine rises.
Regulatory history: Not an approved drug and not an established dietary ingredient with a defined intake. Sold in a small number of longevity supplement products, generally as a salt.
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 Alpha-ketobutyrate 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.
Alpha-ketobutyrate in other countries
Frequently asked questions
Is Alpha-ketobutyrate legal in the United Kingdom?
Alpha-ketobutyrate 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, 2 human studies are cited on its profile. Note: No licensed medicinal indication; availability as a food supplement is limited.
Can I buy Alpha-ketobutyrate in the United Kingdom?
Yes, in supplement or cosmetic form. In the United Kingdom Alpha-ketobutyrate 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: No licensed medicinal indication; availability as a food supplement is limited.
Is Alpha-ketobutyrate MHRA approved?
No. In the United Kingdom Alpha-ketobutyrate 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 and not an established dietary ingredient with a defined intake. Sold in a small number of longevity supplement products, generally as a salt.. On the evidence, 2 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 Alpha-ketobutyrate live on its compound profile.
Alpha-ketobutyrate profileThis page is general information about the regulatory status of Alpha-ketobutyrate 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.