It comes in the form of Caltrate, I'm sure they knew what they were doing when they put it together, I'm not going to take any more vitamins, etc.
I take it because I'm on the Depo Provera injection which I get every 3 months. It causes some calcium loss from my bones, as seen by scans. Since I've been taking Caltrate though, my bones have gotten better. At one stage, I had osteopenia in my hip and spine.