Doctors already know vitamin D is a godsend for strong bones (taken with calcium, of course), but what about cancer prevention? Does it have any affect? Maybe, but the research is incomplete.

The most convincing research suggests vitamin D might help prevent bone fractures, but in terms of cancer prevention, staying smoke-free and slim are better bets.

But before you get down on vitamin D, know it can also help your complexion: stimulating collagen production and enhancing radiance!

MORE: Beauty Foods Rich in Vitamin D