I started having symptoms that I thought might be menopausal, especially hot flashes and night sweats. I asked one of the docs I work with and she suggested black cohosh. Here is the one I chose to start taking.
http://www.walmart.com/ip/Spring-Val...60-ct/10325049
As for any supplement, there are good reviews and bad reviews, but I trust that my doc wouldn't recommend anything unsafe. I don't have hot flashes any more!
Note: I don't know which ingredient it is, but the PM formula has something in it that really smells terrible. You don't taste it though.