PEG-4 METHYL ETHER is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PEG-4 METHYL ETHER

Safety grade: A

This is a lightweight liquid ingredient made in a laboratory that helps products absorb into skin and keeps them from drying out. It also helps dissolve other ingredients in formulas.

It acts as a humectant to draw moisture into the skin and as a solvent to help mix different ingredients together in cosmetic products.

Graded using: COSING.

Last verified: May 26, 2026