Glucosamine, an amino sugar, occurs naturally in quite high concentrations in joint connective tissues, such as cartilage, ligaments & tendons, & in synovial fluid (the watery fluid between joints, which bathes & lubricates joints) Glucosamine supplements helps provide the building blocks to form new joint connective tissues & synovial fluid, to help maintain healthy, flexible, mobile joints Glucosamine is also important for healthy bones, skin, eyes, blood vessels, nails & heart valves This superior form of Glucosamine contains 83% pure Glucosamine & no salt, & has more Glucosamine per gram than Glucosamine sulphate, which contains 59% pure Glucosamine & often up to 30% salt (such as potassium chloride 2 K Cl or sodium chloride 2 Na Cl) Not advisable if taking warfarin May not be suitable for people with a crustacean allergy