... N-acetylglucosamine. It widely consists in the extracellular space of human and animal tissue, vitreum, umbilical cord, skin joints synovia and ... %-0.5% Medical grade HAHA is the main component composing human intercellular substance, vitreum joints synovia, etc. It can retain ... to premature senility. Oral HA can increase HA content in human body, supply deficiency of HA. By digesting and absorbing HA ...