N-Nitroso Propranolol Solution is primarily used as a reference standard or analytical impurity in pharmaceutical testing. It helps in the identification and quantification of nitrosamine impurities that may form during the manufacturing or storage of certain drug products, particularly beta-blockers like propranolol. Due to growing regulatory concerns over nitrosamine contamination in medications, this compound is critical in validating analytical methods such as HPLC and LC-MS for purity and safety testing. It supports quality control processes in pharmaceutical development and ensures compliance with safety guidelines set by health authorities.