... Multiple amino acid and dipeptide, tripeptide are extracted from natural silk. With abundance of 18 kinds of amino acid, namely, ... hydroxyrpropionic acid, beta-parahydroxy-phenylpropionic acid (up to 80%), silk fibroin is white crystallized soluble powder and is prone to ... the cosmetics. Regarding the unique feature of reactive peptide, silk essence, varying from ordinary blended amino acid, has bright ...