Mason Natural Glucosamine & Chondroitin Complex Regular Strength. Soothes Joint Discomfort. Dietary Supplement. Glucosamine is manufactured by the body and is a natural building block of cartilage. Supplementing your body with Glucosamine helps nourish and repair cartilage, which cushions bones and is essential to joint flexibility and comfort. Chondroitin, a natural component of the cartilage of most mammals, supports lubricated, cushioned joint ends, aiding comfortable, flexible movement.