GreenGrown Glucosamine HCL, a Non-GMO and Non-shellfish derived source of Glucosamine combines with MSM, a natural source of organic sulfur, to support healthy joints. Glucosamine is an essential substrate for the formation of glycoaminoglycans (GAG's) and proteoglycans, which are the main components of cartilage tissue. GAG's and proteoglycans trap and hold water, forming a dense fluid cushion within the joint and thus, provide lubrication and shock absorption. MSM (Methylsulfonylmethane) is a natural source of organic sulfur, a mineral necessary for the production of proteoglycans.* This unique and synergistic formula is suitable for vegetarians, because it contains only Glucosamine from a vegetarian source and not from shellfish.