Peptides went from niche bodybuilding compounds to mainstream wellness culture in under five years. The appeal makes sense on the surface, naturally occurring, targeted mechanisms, marketed as smarter than traditional pharmaceuticals. What 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 Ghrelin receptor Introduction BPS IUPHAR Guide to PHARMACOLOGY Direct Peptides Blog