Vitamin C contributes to normal collagen formation for the normal function of bone and cartilage. Copper contributes to the maintenance of normal connective tissues and thus can be beneficial to cartilage (cartilage is made up of connective tissue). Vitamin D, zinc and manganese help maintain normal bones. Vitamin D is provided. 3 In the form of cholecalciferol, it is also produced naturally by the body upon exposure to sunlight.