Difference Between GHRP 2 and GHRP 6 Peptides Comparison Growth Hormone Peptides: The difference between Sermorelin, Ipamorelin, and Tesamorelin Sermorelin, GHRP 6, GHRP 2 9mg (Blend), Packaging Type: Bottle at 3000 box in Medak 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 Vs Sermorelin: Decoding The Differences In Peptide Therapies