Est. 1967 Joint Health Dietary Supplement Mason Guarantee - Laboratory Tested cGMP Certified Glucosamine and Chondroitin are structural components of cartilage, the tissue that cushions the joints. Both are produced naturally in the body. Inside the joints, cartilage undergoes a constant process of breakdown and repair. However, to be properly maintained, the building blocks of cartilage must be present and available. By taking Glucosamine and Chondroitin joint supplements, more of the cartilage building blocks may be available for cartilage support.