氨基酸系维持生命的基本物质,是组成蛋白质的基本单位，是合成人体激素、酶类的原料，参与人体新陈代谢和各种生理机能，在生命中显示其特殊作用。氨基酸可分为必需氨基酸及半必需氨基酸和非必需氨基酸3种。必需氨基酸人体不能形成．须从体外供应；半必需氨基酸体内供应不足， Amino acids are the basic components of life, is the basic unit of the composition of protein, is the synthesis of human hormones, enzymes, raw materials involved in the body’s metabolism and various physiological functions, in life shows its special role. Amino acids can be divided into three kinds of essential amino acids and semi-essential amino acids and non-essential amino acids. Essential amino acids can not form the human body. Must be supplied from the outside; semi-essential amino acid supply in vivo,