The average healthy adult has around 3mm of cartilage to cushion the joints in the knee, but a lifetime of use can take its toll on cartilage. A reduction in cartilage may lead to mild pain and reduced joint mobility. Naturally occurring in the body, glucosamine is one of the key building blocks of cartilage and synovial fluid. Synovial fluid plays a role in joint elasticity, strength and cartilage lubrication. Cautions Always read the label and follow the directions for use. No added gluten, lactose, sugar, artificial flavours, artificial sweeteners, artificial preservatives, or dairy products. The recommended daily dose of this medicine contains 237.12mg of sodium. Contains crustacean products and soya bean.