Body composition evidence brief
Leucine is an essential amino acid that helps trigger muscle protein synthesis. It is commonly promoted for muscle gain, recovery, and enhancing lower-protein meals.
Leucine is important for muscle protein synthesis, but free leucine is usually redundant when total high-quality protein or EAA intake is sufficient.
Leucine-trigger reviews support its role in MPS; free leucine adds little when complete protein is sufficient.
Most practical value is correcting a low-leucine meal or low-protein diet, not stacking extra capsules on top of adequate protein.
Most relevant when meals are low in essential amino acids, protein is impractical, or older/clinical muscle-protein support is the target context.
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