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Leucine is an essential amino acid.
A dietary source of leucine is required since the body cannot make this amino acid.
Leucine belongs to the group of branch-chain amino acids.
Athletic Performance: Leucine, along with the other branch-chain amino acids, might promote muscle recovery after physical exercise.
Phenylketonuria: Leucine might be beneficial for individuals with phenylketonuria (a condition in which the body cannot metabolize the amino acid phenylalanine); however, phenylketonuria always should be treated and monitored by a physician.