PEI-275 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PEI-275

Polyethylenimine

Safety grade: A

This is a synthetic polymer (a chain-like molecule made in a lab) that helps control how thick or thin a product feels. It works by adjusting the thickness of cosmetic formulas to make them easier to apply and use.

PEI-275 thickens or thins cosmetic products to achieve the desired consistency, making them easier to spread on skin and improving their overall feel during application.

Graded using: COSING.

Last verified: May 26, 2026