GHRP-2

GHRP-2 (Growth Hormone Releasing Peptide-2) is a synthetic hexapeptide growth hormone secretagogue with one of the highest GH-releasing potencies in its class. The incorporation of D-2-naphthylalanine in place of D-tryptophan (as in GHRP-6) provides enhanced receptor binding and a somewhat improved selectivity profile.

Research demonstrates GHRP-2 produces substantial GH release while causing less appetite stimulation than GHRP-6, though still more than highly selective compounds like ipamorelin. It does stimulate modest cortisol, prolactin, and ACTH release, indicating activation of multiple hypothalamic-pituitary pathways.

The compound's high potency makes it valuable for research requiring maximal GH stimulation, such as pituitary reserve testing or studies of GH-deficient states. Its robust GH response in aged subjects has made it a useful tool in somatopause research.

GHRP-2 represents an important step in the evolution of GH secretagogues, bridging the gap between first-generation compounds like GHRP-6 and the highly selective agents developed subsequently. Its intermediate selectivity profile provides researchers with options for balancing GH potency against hormonal side effects.