Calcium is the most abundant mineral in the body. Almost all of the calcium in the body is found in skeleton-more than 98% in fact. Therefore, a calcium rich diet is very important in the development, maintenance and normal functioning of nerves, cells, muscle and bones. But sometimes the absorption of calcium from these diet is less in some peoples.so, to overcome with this problem: the solution is to have a supplement of calcium with vitamin D. Vitamin D helps your body absorb calcium and phosphorus. Having the right amounts of vitamin D, calcium, and phosphorus is important for building and keeping strong bones. This combination medication is used to prevent or treat low blood calcium levels in people who do not get enough calcium from their diets.