促胰液素（英语：Secretin）为史上首个被发现的激素，是由十二指肠分泌的含27个氨基酸的激素。它的产生可由多种因素刺激，其中最强的刺激信号是盐酸（胃酸）。这种激素可作用于胰腺导管和胆管系统，使其分泌水和碳酸氢盐，从而产生中和胃酸的效果。

肠抑胃素： I细胞（CCK） · K细胞（GIP） · S细胞（促胰液素）

Secretin is a hormone that regulates water homeostasis throughout the body and influences the environment of the duodenum by regulating secretions in the stomach, pancreas, and liver. It is a peptide hormone produced in the S cells of the duodenum, which are located in the intestinal glands. In humans, the secretin peptide is encoded by the SCT gene.