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 Terminal half life and the flip flop case. This figure illustrates the Download Scientific Diagram PDF) Pharmacokinetic evaluation of ipamorelin and other peptidyl growth hormone secretagogues with emphasis on nasal absorption Pharmacokinetic study of Growth Hormone Releasing Peptide 6 (GHRP 6) in nine male healthy volunteers ScienceDirect