I'm coming in a little late to this conversation, but I hope my experience helps you or someone else down the road.
This is a great site, full of folks who want to grow boobies for their own reasons. Some want to transition, some want to remain male, but with boobies of course! Like many of us, I'm somewhere in the pink fog, in the middle of it all. The things (chemicals, herbs, ground up cow glands) we take during our boobie journeys affect us all differently, or at least to different extents. I want to share how the combination of BO and PM affected me, positive and negative.
I've been cycling on and off PM for at least a couple of years or so. I usually stop a cycle when Mr. Happy stops being as responsive as I like. Typically 3 months. For my last cycle, I took 1500mg of PM, twice daily for a total of 3000mg. After 1 month, I changed my routine to 750mg BO and 1000mg PM together, twice daily for about 2 more months. So a total of 1500mg BO and 2000mg PM. I had much faster growth while taking them together than I ever had on PM alone...but Mr. Happy lost some length and girth, and the dynamic duo (testes) shrunk to 3/4 the size they were prior to this cycle. I ramped down and stopped to allow my bits to recoup. It's been 4 months now, to no avail. The silver lining...even after 4 months off, I can still fully fill my 34b and 36a bras. I really wish the nipple sensitivity would have stayed too!
Straight PM growth has never really stuck around during time outs for me. A little perhaps over the 2-3 years, but very little. Now after my last cycle that included BO, I've finally got some little boobies, but at what cost? And here I am, actually toying with the idea of starting up again and fully understanding the ramifications of what that could bring. Boobie greed is a force to reckoned with!!
I really had no ill effects to speak of other than the shrinkage (which I knew going in was a possibilty with BO) and I had a nasty headache the first two days after starting BO.
Few here speak of their losses below the waist while making gains above. I hope this provides some insight for peeps that like me, don't want to mess with their male bits. You need to seriously weigh these consequences against your want/need for boobies.