Soy peptide is a polypeptide mixture obtained by acid or enzymatic hydrolysis or separation and purification of soybean protein. It is mainly small molecular peptides, and also contains a small amount of large molecular peptides, free amino acids, sugars and inorganic salts. Below 5000u. The protein content of soybean peptide is about 85%, and its amino acid composition is the same as that of soybean protein. The essential amino acid is well balanced and rich in content.