... . It widely consists in the extracellular space of human and animal tissue, vitreum, umbilical cord, skin ... is about 15g in a human body. It plays an important role in human biologic activity. With the ... All in all the decrease of HA in human body will lead to premature senility. Oral HA can ... increase HA content in human body, supply deficiency of HA. By digesting and absorbing ...