Vasopressin (arginine vasopressin, AVP) is a nine-amino-acid cyclic neurohypophyseal hormone that regulates water reabsorption, vascular tone and social behavior through V1a, V1b and V2 receptors. Its multiple receptor actions support wide-ranging studies in renal physiology, cardiovascular regulation and behavioral neuroscience. This product is a white lyophilized powder at >=99% HPLC purity in a sealed vial. Batch-specific quality data and dependable cold-chain delivery are provided. 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.