Encyclopedia BB got ythe facts but another interesting thing is that pro-hormone was perhaps not always a very scientific descriptor for those compounds. Those can be called anabolic steroids too and I believe orgs such as WADA list them under AAS. Then with the Superdrol etc the supp industry came up with the absurd descriptor pro-steroid LOL. Some common AAS have active metabolites and could therefore be pro-hormones as well.
Senator Orrin Hatch (the father of the DSHEA act in America) and the life extension supplement lobby threatened to throw a lot of time and money into fighting the anti-prohormone bills if DHEA wasn't taken off the banned list. Rather than fight Hatch, they took DHEA off the list, citing that it is a very weak precursor with other uses. Hatch went along with the ban after that, and the rest is history.
Thank you, Getbig brethren!!!
I remember how well MuscleTech's Anotesten worked back in the day. So, I've tried to replicate, using Tribulus, DHEA, Tongkat Ali (Longjack) in place of androstenedione, and DIM instead of Indole-3-Carbinol.
So far, so good!! It has definitely helped with the strength and recovery (among other things

).