SynerPro Calcium Magnesium [Vital Nutrition] combination recognizes that each of these minerals depends on the other for proper assimilation in the body. Calcium is essential to the health of bones, teeth and muscles, and it also plays an essential role in blood clotting, nerve conduction and many cellular functions. Magnesium activates more than 300 enzymes in the body and, with calcium, affects nerve and muscle functions. More than 80 percent of the natural magnesium in grains is lost by removal of the germ and outer layers, which happens in food processing. This combination also includes vitamin D, known to work synergistically with calcium, as well as phosphorus, zinc, copper and boron. Four tablets contain the following nutrients in the SynerPro concentrate base: % DV Vitamin D 200 IU 50Calcium 800 mg 80Phosphorus 500 mg 50Magnesium 400 mg 100Zinc 15 mg 100Copper 2 mg 100Boron 1 mg **Daily Value not established.