[Ginie]

Getting back to the topic. Maca is not a phytoestrogen, so, it is safe to take with PM. As for Maca itself - read the archived forum, there's a great thread from, I think, waxingmoon who had the experience with Maca. It balances your own hormones instead of loading your body with phytohormones.

http://www.totalityofbeing.com/FramelessPages/Articles/BreastShape.htm

There're many PM brands out there, I recommend you search the entire forum (incl. old forum) and see what worked for most people.