http://articles.mercola.com/sites/articles/archive/2002/10/16/vitamin-d-osteoporosis.aspxScientists have long known that vitamin D is needed for healthy bones, but the naturally occurring form of the vitamin does not appear to play a direct role in bone formation. Instead, the researchers focused on a lab-modified form of vitamin D calledenCommunityServer 2008.5 SP1 (Build: 31106.3070)