Polyethylene Glycol Gut Texturverbesserung Feuchtigkeit Polyethylene Glycol Beschreibung Also listed as PEG on ingredient labels, it helps keep products stable and performs functions similar to those of glycerine. Because polyethylene glycol can penetrate skin, it is also a vehicle that helps deliver other ingredients deeper into skin. Polyethylene glycol as used in cosmetics is purified for safety.