Growth hormone secretagogues are a class of research compounds that interact with the growth hormone secretagogue receptor (GHS-R) or the growth hormone releasing hormone receptor (GHRHR). This category includes both peptide-based compounds (CJC-1295, Ipamorelin, GHRP-6, Sermorelin, Tesamorelin) and the non-peptide ghrelin mimetic MK-677 (Ibutamoren). Each compound exhibits distinct receptor binding profiles, half-life characteristics, and downstream signaling properties that make them subjects of ongoing preclinical research. CJC-1295 is available in two formulations: without DAC (half-life approximately 30 minutes) and with Drug Affinity Complex (extended half-life 6-8 days), allowing researchers to study both pulsatile and sustained GH secretion models. Ipamorelin is distinguished by its selectivity — research suggests it stimulates GH release without significant effects on cortisol or prolactin secretion. All compounds are supplied as lyophilized powder unless otherwise noted, with purity >99% verified by HPLC analysis.