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L-Leucine ((S)-Leucine) is one of nine essential amino acids in humans (provided by food), L-Leucine is important for protein synthesis and many metabolic functions. L-Leucine contributes to regulation of blood-sugar levels; growth and repair of muscle and bone tissue; growth hormone production; and wound healing. L-Leucine also prevents breakdown of muscle proteins after trauma or severe stress and may be beneficial for individuals with phenylketonuria. L-Leucine is available in many foods and deficiency is rare.

L-Leucine (Standard) is an essential amino acid that can be used for quantitative analysis.L-Leucine plays a key role in protein synthesis, energy metabolism and cell signaling. It is a major activator of mTORC1 (mammalian target of rapamycin protein complex 1) and promotes protein synthesis and cell growth.