This nonmetallic element, known to be necessary to animals, has only recently been added to the list of microminerals possibly needed by the body. Its particular functions are to aid in the synthesis of healthy collagen (connective tissue) and the development of strong, calcium-rich bones. Silicon exists in blood plasma but its concentrations are greatest in the skin and connective tissue. Some researchers believe that silicon reduces the risk of atherosclerosis and may in some way also retard aging and help prevent or lessen arthritis and osteoporosis.