flex   It is a dietary supplement that contains a complex of plants, such as harpago and bamboo, msm (methylsulfonilmethane), hyaluronic acid, collagen, vitamin K and a high content in manganese and C vitamins. Vitamin C contributes to the normal collagen formation for normal bone and cartilage functioning. Vitamins D and K and Manganese contribute to the maintenance of normal bones. Manganese still contributes to normal connective tissue formation.