As we get older, our bones can start to lose calcium. And when this happens, we slowly start to lose our ability to have a nice posture and stay upright. Cal-600 Plus contains 600mg of elemental calcium, Vitamin D3, and other important minerals to keep bones strong and healthy. Nova Cal-600 Plus incorporates calcium of smaller particle size, an average of 2 micron, and uses calcium carbonate as its source, which both aimed to provide a better absorption by the body. 2 micron particle size for improved absorption 600mg elemental calcium, half of your daily requirement Calcium carbonate as the source of calcium