I personally think if your on GH straight for over 2years you can get a shutdown. I was on for about 1.5years and got my natty levels tester afterwards and they were low but in range. I was like 23yrs old at the time. So I went back on GH, then about 2years later I came off and used GHRP6 at 400mcg daily for a month, then took an aditional 3weeks off that so I was completely natural and got levels tested again. They were in the perfect normal range and I was 25yrs old then(still am now) So all in all, I felt as if the GHRP6 acted as a pct for me and recovered my natty gh levels.