GHRP-6 (Growth Hormone Releasing Peptide – 6) is a hexapeptide with a chain comprised of 6 amino acids. It is one of several synthetic met-enkephalin analogs that include unnatural D-amino acids that were developed for their growth hormone releasing activity and are called growth hormone secretagogues. GHRP-6 is true HGH secretagogue.
This growth hormone releasing peptide is distinct from GHRH and do not act at the GHRH receptor, but instead acts at the growth hormone secretagogue receptor, now renamed as the ghrelin receptor.
CJC-1295 is a tetrasubstituted 30-amino acid peptide hormone, primarily functioning as a growth hormone releasing hormone (GHRH) analog. It has D-Ala, Gln, Ala, and Leu substitutions at positions 2, 8, 15, and 27 respectively.