Gastric inhibitory polypeptide
Gastric inhibitory polypeptide (GIP), also known as glucose-dependent insulinotropic polypeptide, is an inhibiting hormone of the secretin family of hormones. While it is a weak inhibitor of gastric acid secretion, its main role, being an incretin, is to stimulate insulin secretion.
Source: Wikipedia — Gastric inhibitory polypeptide (CC BY-SA 4.0)