Glucosamine is a key substrate for the synthesis of glycosaminoglycans and proteoglycans, which are essentialcomponents of cartilage. These substances help maintain the elasticity and shock - absorbing capacity of cartilagereducing friction between joints and protecting the joint surface. Supplementing with glucosamine may help slowdown cartilage degeneration, relieve ioint pain, stiffness, and improve ioint mobility, thus being beneficial for theprevention and treatment of osteoarthritis and other joint diseases.