Design, Biological Characterization, and Discovery of Capromorelin Derivatives as Oral Growth Hormone Secretagogue Receptor Type 1a Agonist for the Treatment of Growth Hormone Deficiency Journal of Medicinal Chemistry Ipamorelin (10mg), A selective growth hormone secretagogue studied for its interaction with ghrelin receptor pathways involved in natural growth hormone release., Commonly referenced in research pamorelin is a pentapeptide that selectively triggers the body's own pulsatile release of growth hormone. Ipamorelin is a five amino acid peptide that acts as a selective ghrelin and growth hormone secretagogue receptor agonist. Growth Hormone Peptides; A Comparative Review