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 Figure 3 from Ipamorelin, the first selective growth hormone secretagogue. Semantic Scholar Ipamorelin Revival Clinic Sermorelin or Ipamorelin: Meaning, Differences, Benefits, Side Effects, and Which One May Be Better