To get the calcium and vitamin D your body needs to support healthy bones and muscles and keep you moving, trust Caltrate, the 1 selling brand of calcium supplements in the United States. Your body needs calcium for more than just strong bones; it also plays a role in supporting your everyday activities like muscle contractions, blood clotting and nerve function. However, you need vitamin D to help calcium work for you. If you have a deficiency in vit. D, it can reduce the amount of calcium your body abs...