Legal status by country
Is L-leucine legal?
Written by Aaron CuhaReviewed Sep 2026
How L-leucine is classified in the United States, United Kingdom, Australia and Canada, side by side. Each country has its own page with a direct answer, the regulator's approval status and what the classification means in practice.
All four countries, side by side
| Attribute | United States · FDA | United Kingdom · MHRA | Australia · TGA | Canada · Health Canada |
|---|---|---|---|---|
| Status | Not approved | Not approved | Not approved | Not approved |
| Classification | Sold as a supplement | Sold as a supplement | Available as a supplement / complementary medicine | Sold as a supplement |
| Note | An essential amino acid present in all dietary protein, and sold separately as a supplement. No drug approval. | None recorded | None recorded | None recorded |
US FDA status: A dietary ingredient and an essential nutrient present in all dietary protein. Not an approved drug and not approved to treat anything.. Reviewed Sep 2026.
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General information current as of Sep 2026, not legal advice. Classifications change; confirm with the regulator or 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.