Legal status · United States
Is Alpha-ketobutyrate legal in the United States?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Alpha-ketobutyrate can be sold in the United States as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: FDA 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 States at a glance
| Classification | Sold as a supplement |
|---|---|
| Note | Sold in a small number of longevity products. No approved indication and no human supplementation trial located. Do not confuse it with alpha-ketoglutarate, a different molecule with its own separate evidence base. |
| FDA approval status | 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. |
| Human studies cited | 2 of 3 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Alpha-ketobutyrate profile, checked against U.S. Food and Drug Administration (FDA) listings at the reviewed date.
What this means
- 01
Alpha-ketobutyrate can be sold in the United States as a supplement, food or cosmetic ingredient under the classification above, without drug approval.
- 02
Supplement status means FDA 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 FDA treats this kind of product
Approves prescription drugs by indication and polices unapproved products, including peptides sold online. Compounding pharmacies may prepare some compounds under a prescription when the FDA places them on a permitted bulk-substances category.
The classification above is the The Longevity Archive reading of U.S. Food and Drug Administration 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 States?
Alpha-ketobutyrate can be sold in the United States as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: FDA 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: Sold in a small number of longevity products. No approved indication and no human supplementation trial located. Do not confuse it with alpha-ketoglutarate, a different molecule with its own separate evidence base.
Can I buy Alpha-ketobutyrate in the United States?
Yes, in supplement or cosmetic form. In the United States 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: Sold in a small number of longevity products. No approved indication and no human supplementation trial located. Do not confuse it with alpha-ketoglutarate, a different molecule with its own separate evidence base.
Is Alpha-ketobutyrate FDA approved?
No. FDA status: 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.. Current US classification: "Sold as a supplement". On the evidence, 2 human studies are cited on its profile.
Related compounds in the United States
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 States, current as of Sep 2026. It is not legal advice, and classifications change; check U.S. Food and Drug Administration 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.