Actually just the opposite. Restricted blood flow actually increases growth. They just completed a few studies in Japan about this using arm and leg cuffs. I could find the ref if you must have it.

Almost all top level guys are using synthol. So I think its just going to have to be accepted. I always find it funny where people draw the line of what cheating is. If you go on to a natural discussion board they would all say we are cheating. Even the super natural people may say creatine monohydrate is cheating. Fuck it, I say its all fair in this game.