Understanding low cortisol ACTH, secondary adrenal insufficiency, hypocorticolism Maternal Pituitary Support Sheehan's Syndrome, Lymphocytic Hypophysitis 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 Releasing Hormone an overview ScienceDirect Topics An insight into the multifunctional role of ghrelin and structure activity relationship studies of ghrelin receptor ligands with clinical trials ScienceDirect