About 30 to 50 pecent of American children and adults don't get enough vitamin D, says coauthor James O'Keefe, M.

CNN: Vitamin D may be essential for heart health

"Scientists agree that as the DRIs are revisited, vitamin D is one of the first recommendations that should be reconsidered, " says Patsy M.

CNN: Vitamin D is hot! Here's how to get it

' I'm not sure the Romney campaign is in such perfect health they can keep taking aspirin and vitamin supplements and expect to win the presidency.

WSJ: Romney VP Choice: Mild or Spicy?