Secretin is a 27-amino-acid gastrointestinal hormone released from duodenal S cells that stimulates pancreatic bicarbonate secretion and regulates gut motility, serving as the founding member of the secretin family of peptides. Its receptor pharmacology supports digestive-physiology and peptide-hormone research. This product is a white lyophilized powder at >=99% HPLC purity in a sealed vial. Complete documentation and bulk options are available. The lyophilized format minimizes moisture exposure and extends shelf life under recommended refrigeration. Each shipment includes product documentation, safety information and a packing list in English, and our logistics partners provide door-to-door service across major markets. Express couriers are used for time-sensitive research deliveries.