PEG-15 Glyceryl Isostearate
Also listed as a PEG on ingredient lists, this helps keep products stable. Because polyethylene glycol can penetrate the skin, it is also a “transport ingredient” that helps deliver other ingredients deeper into the skin. Polyethylene glycol used in cosmetics is purified and safe to use. Although once a concern, reputable cosmetic suppliers have long eliminated impurities from the finished ingredient, making PEGs safe for the skin.