Description

Ipamorelin (INN) (developmental code name NNC 26-0161) is a peptide selective agonist of the ghrelin/growth hormone secretagogue receptor (GHS) and a growth hormone secretagogue.^[2][3] It is a pentapeptide with the amino acid sequence Aib-His-D-2-Nal-D-Phe-Lys-NH₂ that was derived from GHRP-1.^[4]

Ipamorelin significantly increases plasma growth hormone (GH) levels in both animals and humans.^[1][3][5] In addition, ipamorelin stimulates body weight gain in animals.^[5] Like pralmorelin and GHRP-6, ipamorelin does not affect prolactin, follicle-stimulating hormone (FSH), luteinizing hormone (LH), or thyroid-stimulating hormone (TSH) levels.^[3] However, unlike pralmorelin (GHRP-2) and GHRP-6, but similarly to growth hormone-releasing hormone (GHRH), ipamorelin does not stimulate the secretion of adrenocorticotropic hormone (ACTH), or cortisol, and is highly selective for inducing the secretion only of GH.^[3]