Latest report recommends taking Calcium and Vitamin D supplements with caution: "The 14-member expert committee was convened by the Institute of Medicine, an independent nonprofit scientific body, at the request of the United States and Canadian governments. It was asked to examine the available data — nearly 1,000 publications — to determine how much vitamin D and calcium people were getting, how much was needed for optimal health and how much was too much. "
http://www.nytimes.com/2010/11/30/health/30vitamin.html?_r=1&nl=health&emc=healthupdateema2