This product is a kind of colorless transparent liquid gel which is made of hyaluronic acid sodium salt and physiologically balanced salt. HA is widely distributed in animal and human connective tissue extracellylar matrix, with higher concentration in vitreous, umbilical cord, skin, cartilage and synovial fluid. We used bacterical fermentation to product HA material to avoid the risk of carrying virus and media from animal tissue of organs. HA is different from other natural mucopolusaccharide: HA molecule does not contain sulfate groups. It is also not covalently bound protein, and can exist free in the body as freedom chain.