How exactly can progesterone hinder growth? Just asking because I've been on progesterone in some form for approximately thirty three months non stop and I've grown from average to bigger than any normal size range in that time, especially after I started progesterone. And after starting bovine ovary, which too is quite loaded with progesterone according to one of the few studies cited about it, so even more prog...

It hasn't hindered volume growth, it hasn't stopped projection at all, it has only helped with siude branching/fullness, areola width etc. 

Only thing about it is to start bit later than right away, it might be useful to wait until late Tanner stage three before starting, that's the only thing about it, otherwise it can be done orally, rectally or especially topically without any fear of hindering progress in any way. It can only help or not do much, but it wont stop anything.

Also, why toy around feminising hormonal body modificiation if its scary?