"US researchers warned Tuesday of an alarming link between vitamin E supplements and a 17 percent increased risk of prostate cancer, describing the findings as an "important public health concern.""

Not a small study, either. 35,000 guys for 7 years.

Link: Vitamin E boosts prostate cancer risk: study - Yahoo! News

"The study began in 2001 and broke participants into four groups: one would receive selenium, another would get 400 international units of daily vitamin E, another group would take both, and the fourth was prescribed a placebo."

Great, now even vitamins are carcinogenic.