Lots of those things are basically precursors to real AAS. In many cases, some sliver of the original compound turns into something beneficial and the other 95% of it turns into nasty-ass crap your system has to deal with.
IMO they wouldn't be worth it even if they were free. Go with the real stuff.
there are a few good supps out there but stay away from andro and test boosters--you get about 10% of the results you get frrom real test but you also get 100% of the side effects.