Tesamorelin vs. Sermorelin: Peptides to Boost HGH Growth Hormone and Aging Endotext NCBI Bookshelf The most common GH releasing peptides: Ipamorelin A ghrelin receptor agonist that triggers short pulses of growth hormone release from the pituitary with minimal effects on cortisol, prolactin, or appetite. Tesamorelin Ipamorelin is a potent growth hormone releasing peptide that has some potential advantages over some of the others. Although peptides seem to be doled out like aspirin, keep in mind that these are