Yes, hGH can shut down or shift your pituitary axis. No doubt about it according to research and my endo who is one of the foremost experts in the field and a former endo/dietician/trainer for Soviet Olympic athletes throughout out the 80s. Has kept me off the stuff except to heal a serious injury and to get back on the tour quickly. My IGF-1 runs out of range high naturally and I have been advised even low doses could permanently shift my axis. I am waiting until my levels reduce to use for anti aging. Haha, if someone is pinning high doses of GH and later say no shift, I would have to wonder if they are getting their GH from China, Mexico or in the gym. If so, no telling what they are getting. Also, GH is actually difficult to test accurately so I would only rely upon an endo or anti aging doctor trained perhaps in Europe and experienced in this area. US training in this area seems to be well behind that of the manner in which endos are trained in some European countries. I have spent lots over the years flying around the country to so called experts in search of quality doctors in this field before finding my current endo. I personally know guys stuck on the stuff now. Yep, they look great, feel great, **** great and are incredible athletes, but they cannot stop now. On of my best buds has tried to cycle off and cannot.
GH is some potent stuff so pay $$$ to get accurate advise, proper monitoring and real stuff from a pharmacy.