I recently had a run with IML's Osta Rx after coming off cycle during PCT. I didn't notice any mass gain. Maybe a little strength. I intended on using OSTA Rx in order to help maintain muscle mass without using something hormonal and it did exactly that...sort of. I maintained MOST of my hard earned muscle though I did lose a little.
My muscles seemed to be much more dense then when I was on cycle ( Var, Test P ). To be honest, I don't think it was worth that much money, but it did what I wanted it to. Don't go into it thinking that it's going to be just like real gear because it's not.
If I were to prime my body before hand, I'm sure I would have responded much better than what I did.
-TGWT