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Just read through one paper studying the effects of it on GH-deficient patients, kids to be precise. There was also a control group in the study with baseline GH. At the doses used, the GH deficient patients responded very underwhelmingly to the compound. However, they state in the paper that those with baseline GH (that is, healthy/normal GH) had greater responses to the same dose as the GH-deficient groups.
Important to note is that the high dose used was a "pretty high" dose (low dose was 0.2mg/kg, high dose was 0.8mg/kg). This would mean for a 220lb bodybuilder, the high dose would correspond to 80mg. I unfortunately did not see in the paper described above how great the change was in GH for the healthy crowd, but that's not a promising detail. For comparison, remember that the ostarine studies were performed using 3mg of drug, and we bodybuilders currently dose it at 12.5-40mg. Anyways, the paper also brings up a concern, which is that elevated transaminase levels were noted when taking the drug, which could correlate with drug-related toxicity.