Sunshine Nutrition Calcium With Vitamin D 100 TabletsGetting enough calcium and vitamin D is essential to building strong, dense bones when youre young and to keeping them strong and healthy as you age. In addition to building bones and keeping them healthy, calcium helps our blood clot, nerves send messages and muscles contract. About 99 percent of the calcium in our bodies is in our bones and teeth. Each day, we lose calcium through our skin, nails, hair, sweat, urine, and feces, but our bodies cannot