Glucosamine is an amino sugar, meaning it is made from a protein molecule mixed with a sugar molecule. It occurs naturally in the body, although production may decrease with age. Glucosamine is not easily obtained from food sources, so supplements provide a safe and easy way to top up. MSM is a rich naturally occurring source of sulphur, which is required for the structure and function of 150 compounds within the body – including tissues, enzymes, hormones, antibodies and antioxidants. Chondroitin Sulphate is a sulphated glycosaminoglycan, composed of a chain of alternating sugars. It is usually attached to proteins as part of a proteoglycan. Chondroitin sulphates are a structural component of cartilage. Natures Aid Glucosamine, Chondroitin & MSM with Vitamin C provides 500mg Glucosamine, 500mg MSM and 100mg Chondroitin, plus Vitamin C. Vitamin C contributes to normal collagen formation for the normal function of cartilage.