I've got two kids. The first one was concieved 2-3mo after doing a contest where I was probably on for around 5 months straight. Total, I've got 20 cycles + under my belt. The only problem I had was a prostate infection that resulted in me shooting blanks for a couple months while working on our second child. I am absolutely sure this was caused by ECA, not gear. By the way, my kids are totally healthy & absolutely perfect in every way. So, clearly it can be done.....