PEG-18 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PEG-18

Safety grade: A

PEG-18 is a lightweight liquid polymer made from petroleum that acts like a moisture-grabber and helper ingredient in cosmetics. It pulls water into the skin and helps dissolve other ingredients so they work better together in products.

This ingredient attracts and holds moisture in the skin and helps dissolve other substances in cosmetic formulas, making products more effective and easier to apply.

Graded using: COSING.

Last verified: May 26, 2026