Used in lipid research and membrane studies due to its structural role in model bilayers. Commonly employed in the formation of liposomes for drug delivery systems, especially in mimicking inner leaflet composition of cell membranes. Serves as a component in synthetic lung surfactant formulations and is utilized in studying protein-lipid interactions, particularly those involving signaling proteins that bind anionic phospholipids. Its sodium salt form enhances solubility and stability in aqueous buffers, making it suitable for in vitro assays and biophysical experiments.