GHRH vs GHRP Growth Hormone Research Differences PRG GHRP Peptides Group: From Strongest to Weakest Particle Peptides PARTICLE, s. r. o. Effects of GHRP 2 and Hexarelin, Two Synthetic GH Releasing Peptides, on GH, Prolactin, ACTH and Cortisol Levels in Man. Comparison with the Effects of GHRH, TRH and hCRH ScienceDirect Beyond Hunger: Structure, Signaling and Systemic Roles of Ghrelin[v1] Preprints.org 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 Ipamorelin Wikipedia