Difference Between GHRP 2 and GHRP 6 Peptides Comparison Ipamorelin Vs Sermorelin: Decoding The Differences In Peptide Therapies Ipamorelin & GHRP 2 Research Into Growth Hormone Secretion 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 Growth Hormone Peptides: The difference between Sermorelin, Ipamorelin, and Tesamorelin