... , calcium, magnesium, phosphorus, titanium, vanadium, cobalt, manganese, copper, zinc, lithium, strontium, molybdenum, niobium, ge, tin, selenium, silicon and rare earth elements, ce ... , sr can inhibit calculus formation, Calcium, magnesium and copper, zinc, selenium, iodine, titanium, nickel and iron, lithium, ge, can enhance the immune function ...