Calcium, magnesium, vitamin D-3, and zinc all play important roles in maintaining bone and muscle strength and elasticity. Studies have shown that an appropriate supplementation of these minerals to the diet can Enhance to guard against bone loss and the risk of bone and muscle injury. Source Naturals Liquid Calcium 1200 with Magnesium offers the optimum combination of calcium, magnesium, vitamin D-3, and zinc in a great-tasting and highly assimilable liquid form for maintaining proper bone and muscle function.