i always use HCG week 4-5 of my cycle just when my natural test would be shutting down then again teh week before i come off and again the 3rd week i'm off.just how i do it.some people may say different but i'm able to keep all my gains within 2-3 lbs.i also run creatine(5-10gm), taurine(4gms), and glutamine, at the end of my cycle for like a month or two.i don't know.it works for me.take if for what it's worth.good luck to you bro.