GHRP-6

Research-Grade

GHRP-6 is a synthetic hexapeptide, the first GHRP developed (1980s) and the one that led to the identification of the GHSR-1a receptor (before ghrelin itself was discovered). Structurally distinct from later GHRPs, it potently stimulates GH release but also drives substantial ghrelin-like appetite stimulation — which can be a feature (for bulking, or wasting-syndrome indications) or a bug (for most contemporary users). Compared to Ipamorelin: GHRP-6 causes substantially more hunger, elevates cortisol and prolactin more, and has a less clean safety profile in repeated-dose human studies. Contemporary off-label practice has largely replaced it with Ipamorelin. Its continued use is mostly in lean individuals seeking appetite stimulation for weight gain or in wasting-syndrome research.