Synovial-Flex Soft Chews (240 COUNT) Synovial-Flex Soft Chews for dogs is recommended to support healthy joint function in dogs. May help alleviate the pain associated with normal daily exercise and activity. It's a comprehensive nutritional supplement that combines Glucosamine HCl, Perna Canaliculus, MSM and Omega-3 Fatty Acids, Antioxidants, Vitamins and Minerals in a delicious treat like chew.