Glucosamine is an amino sugar, meaning it is made from an amino acid mixed with a sugar molecule. It occurs naturally in the body, although production may decrease with age. MSM is a rich naturally occurring source of sulphur which is required for the structure and function of many compounds within the body. Chondroitin Sulphate is composed of a chain of alternating sugars and is usually attached to proteins as part of a structural substance called a proteoglycan. Natures Aid Glucosamine, Chondroitin & MSM with Vitamin C is a convenient way to supplement with these popular nutrients in an easy to swallow tablet. Providing 500mg Glucosamine Sulphate 2KCl, 500mg MSM plus 100mg Chondroitin Sulphate plus Vitamin C which contributes to normal collagen formation for the normal function of cartilage the tablets are gluten and lactose free.