These chewable tablets contain calcium and vitamin D3, which are both important substances in cell & muscle health and bone formation. Both substances are found in the diet and vitamin D is also produced in the skin after exposure to the sun. CalDorell is used to treat and prevent vitamin D/calcium deficiency, which may occur when your diet or lifestyle does not provide enough of these or when body requirements are increased. This supplement may also be prescribed or recommended during pregnancy or for certain bone conditions such as osteoporosis.