Healthy cartilage depends heavily on many factors including water retention, protection from destructive enzymes and ample nourishment. NOW Glucosamine/Chondroitin Sulfate is a perfectly balanced blend of two naturally occuring elements that may assist the joints in establishing mobility that is not only normal and healthy, but free and easy as well. By increasing water retention (a natural cushion) in the joints, the combination of glucosamine and chondroitin sulfate has been shown to protect joint tissue, and may even provide the materials necessary to naturally repair damaged or eroded cartilage.