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 Prolactin ScienceDirect Hormones.gr Which Evidences Explain Ipamorelin's Recovery Selectivity Without Cort Prime Lab Peptides Normal Physiology of ACTH and GH Release in the Hypothalamus and Anterior Pituitary in Man Endotext NCBI Bookshelf Cortisol Disorders