Didodecyldimethylammonium bromide is widely used as a cationic surfactant in various applications. It is commonly employed in the preparation of liposomes and other lipid-based drug delivery systems, where it helps stabilize the structure and enhance cellular uptake. In molecular biology, it serves as a transfection reagent, facilitating the introduction of nucleic acids into cells for genetic research. Additionally, it is utilized in the formulation of disinfectants and antimicrobial agents due to its ability to disrupt microbial cell membranes. Its surfactant properties also make it useful in industrial processes, such as emulsification and stabilization of colloidal systems, and in the cosmetics industry for stabilizing products like creams and lotions.