The role of 'adipotropins' and the clinical importance of a potential hypothalamicpituitaryadipose axis Nature Reviews Endocrinology 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 Hormones.gr ACTH (Adrenocorticotropic Hormone), Cushing's Syndrome Labpedia.net