I would put money on it that most pros use heavy gh and slin bro. That coupled with a lot of test and other heavy roids can produce a massive build like the pros. I saw a list of roids that one pro was using(not even a top pro) I wish I could find the site, but it would blow your mind man. He was putting a few grand a month down for his use. It would be very interesting to see if someone could find out a few of the top pros cycles. The real ones not some bc that they want you to believe. We r talking grams of test here.