Peptide Science USA - GHRP-6 (Growth Hormone Releasing Peptide-6) is a synthetic peptide that stimulates the release of growth hormone (GH) by activating the ghrelin receptor in the pituitary gland. It is used in research to study its effects on muscle growth, fat loss, and overall GH secretion. GHRP-6 is also known to increase appetite due to its action on the ghrelin receptor.