Vegetarian Vegan Non GMO Gluten Free Wheat Free Glucosamine MSM Joint Health NOW Vegetarian Glucosamine MSM combines two will-known joint support ingredients in a vegetarian vegan friendly formula that does not include shellfish-derived Glucosamine. Glucosamine is an essential building block for the formation of glycosaminoglycans GAGS and proteoglycans, the main components of cartilage tissue. These compounds attract water to form a joint cushion, providing lubrication and shock absorption. MSM methylsulfonylmethane is an organic for of sulfur, a mineral necessary for the production of GAGs and proteoglycans.