I'd start with hcg and run labs and sperm count after awhile. I was on for 10+ years and went from 0 sperm to a low count with just hcg added to test and mast. I ended up tapering off and returned my sperm count to normal and got my wife pregnant after 7 months of last pin. I had better labs with hmg as well but sperm count was no better, so I suggest adding hmg if the hcg doesn't work, but also be prepared to come off of necessary. It's worth it when it's time!