Bradykinin is a nine-amino-acid vasoactive peptide generated by the kinin-kallikrein system, acting through B1 and B2 receptors to regulate blood pressure, vascular permeability, inflammation and pain signaling in experimental models. It is supplied as a high-purity white lyophilized powder at >=99% HPLC purity in sealed vials with good stability and simple reconstitution. It is applied in cardiovascular research, inflammation studies, receptor pharmacology and smooth-muscle bioassays, and is a standard tool for investigating the kinin pathway in many laboratories. Each batch is manufactured under controlled quality systems and batch-specific certificates of analysis are obtainable on request. Store the sealed vial at 2-8 degree C away from direct light and humidity; for extended storage keep at -20 degree C and minimize freeze-thaw cycles. Small sample orders and bulk quantities are both welcomed, and we provide OEM, private-label and secure neutral-packaging services for global delivery. Laboratory research use only.