Cosequin DS Chewable Tablets is a patented, scientifically researched nutritional supplement dispensed by thousands of veterinarians to help dogs maintain healthy joints. As dogs age, it is common for their joints to become less flexible which impacts their mobility and quality of life. Even at younger ages some dogs are subject to joint health concerns which affect flexibility and mobility. Cosequin is an exclusive formula of three ingredients: Chondroitin Sulfate, Glucosamine Hydrochloride and Manganese Ascorbate.