Well, Ive seen enough second hand blood work to know that anabolic steroids can indeed wreak havoc on a man's natural testosterone/sperm production. Just like anything else, it is mostly genetic(and related to the specific choice of compounds used) that will determine the total effect on the HPTA.
I'm a lucky guy, I have very high natural testosterone levels. Prior to my steroid use at age 20, I had almost 2,000ng/dl! I am not surprised that I am still highly fertile after many years of virtually non-stop steroid use.
Not "2000ng/l" Ross. I've seen you post 1000ng/l. I was at 930ng/l at 19 years old.