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 help to guard against bone loss and the risk of bone and muscle injury. Source Naturals Liquid Calcium with Magnesium offers a 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.