Legal status · United States
Is (R/S)-1,3-Butanediol legal in the United States?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
(R/S)-1,3-Butanediol can be sold in the United States as a supplement or cosmetic ingredient, classified as "Sold as a dietary 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, 3 human studies are cited on its profile.
(R/S)-1,3-Butanediol in the United States at a glance
| Classification | Sold as a dietary supplement |
|---|---|
| FDA approval status | Not a drug. Permitted in the US as a food additive solvent for flavourings; sold in ketone supplement products. Not approved for any indication. The ITP lifespan result is equivocal: a site-dependent 2 percent female gain by log-rank and a Gehan-only 9 percent male gain, at 10 percent of the diet. |
| Human studies cited | 3 of 6 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the (R/S)-1,3-Butanediol profile, checked against U.S. Food and Drug Administration (FDA) listings at the reviewed date.
What this means
- 01
(R/S)-1,3-Butanediol 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 (R/S)-1,3-Butanediol is
The Interventions Testing Program's most equivocal result: a 2 percent female median gain that depended on which sites were included, a 9 percent male median gain that reached significance only by the Gehan test, and 10 percent of the diet by weight to get either. In people it raises blood ketones for a few hours, caused moderate to severe gut symptoms in 5 of 9 cyclists, and did not improve their time trial.
1,3-Butanediol is a small alcohol that the liver converts to beta-hydroxybutyrate, so drinking it produces a state of mild ketosis without fasting or a ketogenic diet. It is an approved food additive solvent, the backbone of several commercial ketone ester drinks, and is sold on its own in some ketone supplements.
Mechanism: 1,3-Butanediol is oxidised in the liver by alcohol and aldehyde dehydrogenases to beta-hydroxybutyrate, the main circulating ketone body. The (R) enantiomer yields the physiological D-beta-hydroxybutyrate; the (S) enantiomer yields the L form, which is metabolised differently and whose effects are less studied, and the racemate the ITP used produces both.
Regulatory history: Not a drug. Permitted in the US as a food additive solvent for flavourings; sold in ketone supplement products. Not approved for any indication. The ITP lifespan result is equivocal: a site-dependent 2 percent female gain by log-rank and a Gehan-only 9 percent male gain, at 10 percent of the diet.
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 (R/S)-1,3-Butanediol 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.
(R/S)-1,3-Butanediol in other countries
Frequently asked questions
Is (R/S)-1,3-Butanediol legal in the United States?
(R/S)-1,3-Butanediol can be sold in the United States as a supplement or cosmetic ingredient, classified as "Sold as a dietary 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, 3 human studies are cited on its profile.
Can I buy (R/S)-1,3-Butanediol in the United States?
Yes, in supplement or cosmetic form. In the United States (R/S)-1,3-Butanediol is classified as "Sold as a dietary 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.
Is (R/S)-1,3-Butanediol FDA approved?
No. FDA status: Not a drug. Permitted in the US as a food additive solvent for flavourings; sold in ketone supplement products. Not approved for any indication. The ITP lifespan result is equivocal: a site-dependent 2 percent female gain by log-rank and a Gehan-only 9 percent male gain, at 10 percent of the diet.. Current US classification: "Sold as a dietary supplement". On the evidence, 3 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 (R/S)-1,3-Butanediol live on its compound profile.
(R/S)-1,3-Butanediol profileThis page is general information about the regulatory status of (R/S)-1,3-Butanediol 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.