L-leucine is one of the eight essential amino acids, and belonging to the aliphatic amino acids within twenty kinds of proteins. L-leucine and L-isoleucine and L-valine are called three branched chain amino acids. L-leucineLeucine and D-leucine are enantiomers . It is a white shiny hexahedral crystal or white crystalline powder at room temperature , Odorless, slightly bitter .

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L-Leucine is an essential branched-chain amino acid (BCAA) that plays a critical role in protein synthesis and muscle repair. Its primary application is in the sports nutrition and dietary supplement industry, where it is hailed as the most potent activator of the mTOR signaling pathway, directly stimulating muscle protein synthesis for athletes and bodybuilders. In the pharmaceutical sector, L-Leucine is used as a key component in parenteral nutrition (IV drips) and for treating liver diseases and muscle wasting conditions. In infant formula, it is an indispensable additive to support healthy growth and metabolic development. Furthermore, it serves as a specialized lubricant in the tableting process for the pharmaceutical and food industries, and as a starting material for synthesizing various flavorings and biochemical reagents.