calcium tablets with vitamin d from the canadian company jovital.Calcium is one of the most important minerals in the human body and the most abundant in it, which benefits the body in several main things to maintain optimal health. The people most need calcium: Pregnant women to provide the fetus with the calcium it needs. Women of young age to prevent osteoporosis. Older adults to prevent osteoporosis. Cortisone users to make up for what the body loses due to taking cortisone. Patients with bone fractures to supply the body with calcium needed for bone building.