L-leucine (E641)
- Food Fine
What is L-leucine (E641)?
L-leucine (E641) is an amino acid, one of the building blocks of protein, used as a flavour enhancer and in sweetener tablets. The amounts in food are not a concern. It's fine at normal amounts; only very large isolated doses, such as high-dose supplements, are less well studied.
What is Yasno’s verdict on L-leucine?
Yasno’s verdict on L-leucine: Fine. No meaningful concern at normal amounts.
Is L-leucine allowed in the EU?
EU status of L-leucine: Permitted as a food additive. Conditions and limits come from the regulation cited below. Yasno summarises them and does not replace the legal text.
| Where | EU | US |
|---|---|---|
| Food | Permitted as a food additive | Regulated as a food additive by the US FDA |
What else is it called?
- leucine
- (S)-2-Amino-4-methylpentanoic acid
- (S)-Leucine
Sources
- EU Food Additives Register — POL-FAD-IMPORT-3346, European Commission (DG SANTE), 2015
Always check the physical label. Yasno describes evidence and regulatory status. It never says a product is free of an allergen or safe for you, and it is not medical advice.
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