L-Isoleucine is aliphatic amino acids ,one of twenty protein amino acids and one of eight essential for human body, also is branched-chain amino acids. It can promote protein synthesis and improve the level of growth hormone and insulin, to maintain balance in the body, can increase the body's immune function, treat mental disorders, to promote an increase in appetite and the role of anti-anemia, but also with the promotion of insulin secretion. Mainly used in medicine, food industry, protect the liver, liver role in muscle protein metabolism is extremely important. If lack, there will be physical failure, such as the state of coma. Glycogenetic and ketogenic amino can be used as nutritional supplements. For the amino acid infusion or oral nutritional additives.