Vetri-Science Glyco-Flex III for Dogs (120-count Bottle) Contains Perna canaliculus, Glucosamine HCl, Dimethylglycine, Methylsulfonylmethane, Manganese, Vitamin C, Vitamin E, Selenium, Grape Seed Extract, and Glutathione Most complete joint formula Provides factors necessary for joint restoration Support for joints and connective tissue health Helps alleviate severe discomfort and joint stiffness