LEAP2 Is an Endogenous Antagonist of the Ghrelin Receptor: Cell Metabolism 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 Ipamorelin: A Scientific Perspective on a Selective Growth Hormone Secretagogue PARTICLE, s. r. o. Table 3 from Ipamorelin, the first selective growth hormone secretagogue. Semantic Scholar Molecular recognition of an acyl peptide hormone and activation of ghrelin receptor Nature Communications