The role of cortisol and prolactin in the pathogenesis and clinical expression of psychotic disorders ScienceDirect Therapeutic Peptides in Aesthetic, Metabolic and Endocrine Conditions: Effects, Safety, Clinical Applications, and Future Perspectives Comparison of the Effects of Ketamine and Memantine on Prolactin and Cortisol Release in Men: A Randomized, Double blind, Placebo controlled Trial Neuropsychopharmacology 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: structure, receptors, and functions Reviews in Endocrine and Metabolic Disorders Springer Nature Link