Ipamorelin is a potent growth hormone releasing peptide that has some potential advantages over some of the others. Although peptides seem to be doled out like aspirin, keep in mind that these are Molecular recognition of two approved drugs Macimorelin and Anamorelin by the growth hormone secretagogue receptor Acta Pharmacologica Sinica Beyond Hunger: Structure, Signaling and Systemic Roles of Ghrelin[v1] Preprints.org From Belly to Brain: Targeting the Ghrelin Receptor in Appetite and Food Intake Regulation Ipamorelin is a pentapeptide. Five amino acids. That's it. But three of those five don't exist in nature. The sequence: Aib His D 2 Nal D Phe Lys, with a C terminal amide. Position 1 is aminoisobutyric acid the