It is a premium quality formula used to prevent or treat low blood calcium levels in people who do not get enough calcium from their diets. It may be used to treat conditions caused by low calcium levels, such as bone loss (Osteoporosis), because if there is not enough calcium in the blood, then the body will take calcium from bones, thereby weakening them. It can also be used in the decreased activity of the parathyroid gland (Hypoparathyroidism) and a certain muscle disease (Latent Tetany). It may also be used in certain patients to ensure they are getting enough calcium, including women who are pregnant, nursing, or postmenopausal, and people taking certain medications such as phenytoin, phenobarbital, or prednisone. Calcium plays a very important role in the body as it is necessary for the normal functioning of nerves, cells, muscles, and bones. If there is not enough calcium in the blood, then the body will take calcium from bones, thereby weakening them. Vitamin D helps the body absorb calcium and phosphorus. Having the right amounts of vitamin D, calcium, and phosphorus is important for building and maintaining strong bones.