A feature article on Vitamin D from The Scientist magazine:
http://the-scientist.com/2012/03/01/vitamin-d-on-trial/
Once a month for the next 5 years, 20,000 people across the United States will find a package containing 62 pills in their mailboxes. As participants in a clinical trial, the recipients agreed to swallow two of the pills daily. But inevitably as the years pass, some pill packets will become buried under a stack of letters, or forgotten in a drawer. After all, these pills contain only vitamin D, fish oil, or an inert placebo—a person doesn’t need them to make it through the day. Plus, no one monitors who takes the pills daily and who does not.............
vit d studies and mortality rate
http://www.vitamindwiki.com/tiki-browse_categories.php?parentId=30&sort_mode=created_desc