Legal status · Canada
Is (R/S)-1,3-Butanediol legal in Canada?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
(R/S)-1,3-Butanediol can be sold in Canada as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: Health Canada 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 Canada at a glance
| Classification | Sold as a supplement |
|---|---|
| Health Canada approval status | Not a Health Canada drug approval; sold as a supplement or cosmetic |
| 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 Health Canada, Health Products and Food Branch (Health Canada) listings at the reviewed date.
What this means
- 01
(R/S)-1,3-Butanediol can be sold in Canada as a supplement, food or cosmetic ingredient under the classification above, without drug approval.
- 02
Supplement status means Health Canada 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 Health Canada treats this kind of product
Authorises drugs for sale through a Notice of Compliance and Drug Identification Number. A compound that is not authorised for sale cannot lawfully be sold for human use, and personal importation of prescription drugs is limited.
The classification above is the The Longevity Archive reading of Health Canada, Health Products and Food Branch 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
United States
Not approvedSold as a dietary supplement
Is (R/S)-1,3-Butanediol legal in the United States?United Kingdom
Not approvedSold as a supplement
Is (R/S)-1,3-Butanediol legal in the United Kingdom?Australia
Not approvedAvailable as a supplement / complementary medicine
Is (R/S)-1,3-Butanediol legal in Australia?Frequently asked questions
Is (R/S)-1,3-Butanediol legal in Canada?
(R/S)-1,3-Butanediol can be sold in Canada as a supplement or cosmetic ingredient, classified as "Sold as a supplement". That is not drug approval: Health Canada 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 Canada?
Yes, in supplement or cosmetic form. In Canada (R/S)-1,3-Butanediol 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.
Is (R/S)-1,3-Butanediol Health Canada approved?
No. In Canada (R/S)-1,3-Butanediol is classified as "Sold as a supplement", which is not a Health Canada marketing approval. For comparison, the US FDA status is: 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.. On the evidence, 3 human studies are cited on its profile.
Related compounds in Canada
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 Canada, current as of Sep 2026. It is not legal advice, and classifications change; check Health Canada, Health Products and Food Branch 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.