Gastric Inhibitory Peptide, porcine is a glucose-dependent insulinotropic polypeptide, is a 42 amino acid intestinal hormone with effects on fat and glucose metabolism[1].
[1] G W Morrow, et al. The insulinotropic region of gastric inhibitory polypeptide; fragment analysis suggests the bioactive site lies between residues 19 and 30. Canadian Journal of Physiology and Pharmacology. January 1996. Volume 74.