PEG-18 glyceryl oleate/cocoate (INCI) is a polyethylene glycol derivative used in cosmetic products. Glyceryl oleate/cocoate are glycerol esters of oleic acid and cocolic acid. The fatty acids used for esterification may also contain other fatty acids. The number 18 after "PEG-" indicates the average number of molecular units -CH2-CH2-O-. PEG-18 glyceryl oleate/cocoate acts as emulsifier.