Leucine

Leucine is an essential branched-chain amino acid that humans must obtain from food. It is incorporated into proteins and helps regulate muscle protein synthesis through nutrient-sensing pathways.

mTORC1: A protein complex that senses nutrients and growth signals and regulates cell growth and protein synthesis. Leucine activates this nutrient-sensing complex, helping stimulate muscle protein synthesis.
Amino acid: An organic molecule with amino and carboxyl groups that serves as a protein building block or metabolic intermediate. Leucine is one member of this broader molecular family.
Dietary protein: Protein consumed in foods or supplements that supplies amino acids for bodily functions. It is the main dietary source of leucine.
Isoleucine: An essential branched-chain amino acid that is a structural isomer of leucine. The two share a molecular formula but differ in side-chain structure and metabolism.
Muscle protein synthesis: The cellular process of building muscle proteins from amino acids. Leucine can stimulate this process, although adequate amino acids and other conditions are also required.
Essential amino acid: An amino acid that humans cannot synthesize in sufficient amounts and must obtain from the diet. Leucine is essential because human metabolism cannot make enough to meet needs.
Whey protein: A group of milk proteins separated during cheese production, commonly used in dietary supplements. Whey provides leucine along with the other essential amino acids.
Valine: An essential branched-chain amino acid with a nonpolar side chain. Valine is leucine’s third branched-chain counterpart, but it does not have leucine’s same signaling potency.
Amino acid sensing: Cellular detection of amino acid availability that adjusts metabolism and growth. Leucine is one signal cells use to assess nutrient availability.
Branched-chain amino acid: An amino acid with a branched aliphatic side chain; the group includes leucine, isoleucine, and valine. Leucine belongs to this group, whose members share some transport and metabolic pathways.

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