Glyco-Flex® I contains Perna canaliculus, Glucosamine HCl, and Dimethylglycine to help support the rebuilding of collagen, cartilage, and joint structures.It is part of the Vetri-Science® stage of life program. STAGE 1, REINFORCEMENT, for younger dogs or dogs predisposed to hip or joint dysfunction for the maintenance of optimal joint health. Glyco-Flex® I supports the structure and function of joints and connective tissue for puppies and dogs throughout their lives.