Sodium Lactobionate is the sodium salt of lactobionic acid, a disaccharide acid derived from lactose. It is a white to off-white crystalline powder that is highly soluble in water. Its primary application is in the pharmaceutical industry as a key excipient. It serves as a highly effective tonicity-adjusting agent and stabilizer in various injectable formulations, particularly in organ preservation solutions (e.g., University of Wisconsin solution) due to its non-penetrating, large molecular size which helps prevent cell swelling. It also functions as a chelating agent and pH buffer. In the food industry, it is used as a firming agent, humectant, and chelating agent in certain food products. As a multifunctional ingredient, it is valued for its safety profile, biocompatibility, and ability to maintain osmotic balance and stability in complex formulations.