OsteoProCare is an excellent source of calcium. One serving provides 1,200 mg of calcium (120% DV). OsteoProCare is an excellent source of magnesium, iron, zinc, selenium, chromium, molybdenum, manganese, copper, and vitamin D3. For calcium to be properly absorbed and utilized, there are several co-factors necessary such as: magnesium, boron, Vitamin D3, zinc, and copper.