Skip to content
DE
Amino acid

Leucine

Leucine is an essential branched-chain amino acid (BCAA) that comes from protein foods. It is mostly studied for its part in building muscle protein.

Also listed as L-Leucine

FitnessEnergy

What does the German safety assessment say?

BfR derived an adult guidance value of 4.0 g/day for supplemental isolated leucine, using animal data because human safety data were insufficient. High isolated BCAA intake may raise blood ammonia. This guidance is not an intake target. 1

BfR advises children, adolescents, pregnant and breastfeeding people to avoid substantial isolated BCAA supplementation. Its guidance does not cover reduced kidney function or low-protein diets; these situations require medical discussion. 1

For information, not individual medical advice. Ingredient studies do not establish the effectiveness of these products.

Sources