GHRP-2 (growth hormone releasing peptide) is an hGH secretagogue. GHRP-2 is newer than GHRP-6
GHRPs are a small family of peptides acting at the pituitary and the hypothalamus to release Growth Hormone. They were discovered 20 years ago as synthetic metenkephalin- derived oligopeptides (Synthetic tissue derived amino acids). Although it has no structural homology with Growth Hormone Releasing Hormone (GHRH), in clinical studies GHRP-2 demonstrated action on the pituitary to release Human Growth Hormone (HGH). GH secretagogues present a tool for furthering our understanding of the control of GH secretion, as well as a unique therapeutic opportunity. These compounds activate the receptors of a putative endogenous ligand in the hypothalamus and pituitary. Acting as functional somatostatin antagonists, GH secretagogues potentiate the actions of GHRH on GH secretion, enhancing pulsatile GH secretion.