Glucosamine is believed to be an effective supplement in maintaining joint and cartilage health in the canine athlete. Glucosamine also encourages the body to manufacturer the collagen and proteglycans necessary for the repair of articular cartilage in stressed and injured joints. The 8-in-1 company, leaders in quality supplements manufacture these tablets, and your dog will love the delicious liver flavor. Each tablet contains 500mg Glucosamine Hydrochloride and 100 mg Vitamin C.