According to an article over at abcnews
"Scientists are excited about a vitamin again. But unlike fads that
sizzled and fizzled, the evidence this time is strong and keeps
growing. If it bears out, it will challenge one of medicine's most
fundamental beliefs: that people need to coat themselves with sunscreen
whenever they're in the sun. Doing that may actually contribute to far
more cancer deaths than it prevents, some researchers think. .... "
Read more at abcnews.com