Used in liposome formulations for drug delivery, especially in pharmaceuticals and cosmetics, due to its ability to integrate into cell membranes and enhance bioavailability of active ingredients. Commonly found in pulmonary surfactant replacements for treating respiratory distress syndrome in premature infants. Also serves as a key component in transdermal delivery systems and nanoemulsions, improving stability and penetration through skin layers. Widely applied in research as a model phospholipid for studying membrane structure and lipid-protein interactions.