Tata 1mg Calcium + Vitamin D3, Zinc, Magnesium and Alfalfa Tablets Help In Joint Support , Energy Health are beneficial for people who do not get enough calcium from their regular diet. While Calcium is necessary for the normal functioning of nerves, cells, muscles, and bones. Vitamin D helps in the absorption of Calcium in your body. Having the right amount of Calcium and Vitamin D is important for strong bones. The Calcium and Vitamin D3 combination is also beneficial for women who are pregnant, nursing, or in their post-menopausal stage.