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A compound that mimics the action of ghrelin, the endogenous "hunger hormone," by binding to and activating the growth hormone secretagogue receptor (GHS-R1a). Ghrelin mimetics stimulate growth hormone release through a pathway independent of GHRH, making them complementary to GHRH analogs. Research peptides in this class include GHRP-2, GHRP-6, ipamorelin, and hexarelin, each with varying selectivity profiles and documented effects on appetite, GH release, and cortisol levels.