Calvisol supplementation may be done for:

Calcium Deficiency
Vitamin D Deficiency
Low dietary intake of Calcium and Vitamin D

This combination medication is 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), weak bones (osteomalacia/rickets). It may also be used in certain patients to make sure they are getting enough calcium (e.g., women who are pregnant, nursing).

Calcium plays a very important role in the body. It is necessary for normal functioning of nerves, cells, muscle, and bone. If there is not enough calcium in the blood, then the body will take calcium from bones, thereby weakening bones. Vitamin D helps your body absorb calcium. Having the right amounts of vitamin D, calcium is important for building and keeping strong bones.