Therapeutic Peptides in Aesthetic, Metabolic and Endocrine Conditions: Effects, Safety, Clinical Applications, and Future Perspectives 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 Frontiers Non Canonical Effects of ACTH: Insights Into Adrenal Insufficiency Reproductive Endocrinology Prolactin Disorders: Causes, Symptoms, and Treatment Options