Flex-Eze is a dietary supplement that contains Glucosamine Sulfate, Chondroitin Sulfate, M.S.M , Sodium Hyaluronic, Boswella Serrate, Yucca, and Superoxide Dismutase which work together to improve performance by increasing the horse’s supply of joint- lubricating synovial fluid, and repairing and strengthening bodily parts that exercise can put under high stress.