Growth Hormone (GH): Source, Functions, Disorders & Mechanism Handwritten Infographic Notes Growth Hormone (GH), also known as Somatotropin, is a vital peptide hormone secreted by the anterior pituitary gland. It 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 Direct Peptides Blog 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