trace elements



  • mineral elements, usually metals in various chemical forms, which are needed by the body for optimum health in quantities of less than 50 mg per day. Those currently identified as necessary are, in alphabetical order, chromium, cobalt, copper, fluorine, iodine, iron, manganese, molybdenum, nickel, selenium, silicon, vanadium and zinc. Other minerals required in greater daily quantities and not classed as trace elements are calcium, chlorine, magnesium, phosphorus, potassium and sodium.