Used in cosmetic and pharmaceutical formulations as a skin-conditioning agent and emulsifier. Enhances the stability of lipid-based delivery systems, such as liposomes and nanoemulsions, improving the penetration of active ingredients through the skin. Commonly found in topical creams, serums, and transdermal patches due to its biocompatibility and ability to mimic components of natural cell membranes. Also serves as a choline phosphate derivative in synthetic phospholipid mixtures for research and drug development.