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

TETRASILOXANE

Safety grade: A

A silky smoothing ingredient made from silicon compounds that helps cosmetic products glide smoothly onto skin and hair. It creates a lightweight, non-greasy feel and is commonly used in primers, foundations, and serums to improve how products apply and wear throughout the day.

Graded using: COSING.

Last verified: June 9, 2026