Black cohosh linked to more aggressive forms of cancer.
http://www.msnbc.com/news/938699.asp?0cv=CB10
Black cohosh linked to more aggressive forms of disease
WASHINGTON, June 13-Black cohosh, a herb popular for relieving the hot flashes and some other unpleasant symptoms of menopause, may make cancer more likely to spread, U.S. and Canadian researchers said.
Can anything NOT cause cancer?