Ipamorelin is a synthetic pentapeptide and a selective agonist of the ghrelin/growth hormone secretagogue receptor (GHS-R). It is recognized in the research community as one of the most specific growth hormone (GH) stimulants, distinguished by its ability to provoke GH release without significantly impacting levels of cortisol, prolactin, or ACTH. This high level of selectivity makes it a primary tool for studying the somatotropic axis and metabolic regulation in preclinical models.