What are benefits of Prohormones?

Im writing an essay on Prohormones(a supplement that's one molecule away from an anabolic steroid) but i have been having trouble finding some benefits that can be used as an argument against the cons. In addition to the essay im also taking on body building as my project for senior year. Due to the lack of information on the internet, i was wondering if anyone could name pros of the supplement, and/or include a reliable source