Leucine, L- (8CI); (2S)-2-Amino-4-methylpentanoic acid; L-2-Amino-4-methylpentanoic acid,(S)-2-amino-4-methylpentanoic acid,L-Leucine is an essential amino acid. L-Leucine acts as a nutrient signal to stimulate protein synthesis. It has also activates the mammalian target of rapamycin kinase that regulates cell growth.,Leucine