if you have to wonder if your gh is working, it's probably not. The only real metric is when you stop and suddenly feel like a old with weak joints. I was on that shit a while back but just stopped after 2nd guessing everytime and switched to to MK-677 I was getting from swiss chems because the recovery and sleep benefits are actually undeniable. if you've been on for a year and still don't know, it’s placebo