1,Grade:Food grade,Cosmetic Grade 2,CAS no: 9004-61-9 3,Appearance: White powder Hyaluronic acid (HA) is a straight chain macromolecular mucopolysaccharide composed Of repeat disaccharide units of glucuronic acid and N-acetylglucosamine. It widely consists in the extracellular space of human and animal tissue, vitreum, umbilical cord, skin joints synovia and cockscomb, etc.The commercial HA is ...