PEI-45 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PEI-45

Safety grade: A

PEI-45 is a synthetic polymer, which is a chain-like molecule made in a laboratory. It's designed to help control how thick or thin a product feels when you apply it.

This ingredient is used to adjust the thickness and flow of cosmetic products, making them easier to spread on skin while maintaining the desired consistency.

Graded using: COSING.

Last verified: May 26, 2026