Polyethylene Glycol
Reviewed by Kate · Last updated 18 Aug 2026
Also known as: PEG
Helps keep products stable | Functions similar to glycerin
Addresses
EWG Safety Score
What Is Polyethylene Glycol?
Also listed as PEG on ingredient labels, it helps keep products stable and performs functions similar to those of glycerin. 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.
Clinical Evidence & References
Published Research
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Drug Delivery, October 2016, pages 3,101-3,110 [https://pubmed.ncbi.nlm.nih.gov/27854145/]
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Toxicology, October 2005, pages 1-38 [https://pubmed.ncbi.nlm.nih.gov/16011869/]
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Polypropylene Glycol
Polymer of propylene glycol | Functions as a humectant and delivery agent
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