Here is the NIH press release of a study published in today's Annals of Internal Medicine.
I'll have to take a closer look at the specific formulations of the supplements tested (two of which contained black cohosh extracts) and study design before commenting more extensively. The trial was supported jointly by NIH's National Institute on Aging (NIA) and the National Center for Complementary and Alternative Medicine.
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From the article:
Of course; I'm shocked they did not. They do so when animals are the objects of study, why not plants?