Glucosamine Sulfate by Foodscience Of Vermont. Glucosamine is an amino sugar normally formed in the body from glucose. It is the starting point for the synthesis of glycosaminoglycans (GAGs), including hyaluronic acid, a main constituent of joint fluid. Glucosamine supplementation can Enhance support the thick gelatinous nature of the joint fluids as well as proper functioning of joints, spinal discs, and other connective tissue.