The calcium in Calcium Vitamin D3 from Webber Naturals is chelated, making it more readily absorbed and utilized by the body. Calcium intake, when combined with sufficient vitamin D, a healthy diet, and regular exercise, may reduce the risk of developing osteoporosis. This supplement not only helps build strong bones and teeth, it also helps support immune function. Easy absorption. May reduce the risk of osteoporosis. Combination of calcium and vitamin D in one product. Helps support bone health.