PEI-15 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PEI-15

Safety grade: A

PEI-15 is a synthetic polymer that helps control how thick or thin a product feels. It's used to adjust the texture and consistency of cosmetic formulas so they spread smoothly and feel pleasant on the skin.

This ingredient thickens or thins cosmetic formulas to achieve the desired texture and consistency, making products easier to apply and improving their overall feel on the skin.

Graded using: COSING.

Last verified: May 26, 2026