GHRP and Penis Growth: What the Evidence Actually Shows Table 3 from Ipamorelin, the first selective growth hormone secretagogue. Semantic Scholar Ipamorelin and CJC 1295 are almost always discussed together in research circles, and the reason comes down to receptor pharmacology. The two peptides work through entirely different but complementary mechanisms that produce a Effects of GHRP 2 and Hexarelin, Two Synthetic GH Releasing Peptides, on GH, Prolactin, ACTH and Cortisol Levels in Man. Comparison with the Effects of GHRH, TRH and hCRH ScienceDirect