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

TRIMETHYLAMINE OXIDE

Safety grade: A

Trimethylamine oxide is a compound found naturally in some marine organisms that helps retain moisture in skin and tissues. In cosmetics, it's used to keep products feeling fresh and to help mask unwanted odors.

This ingredient works as a humectant to draw moisture into the skin and help maintain hydration, while also functioning as a masking agent to reduce or hide unpleasant odors in cosmetic formulations.

Graded using: COSING.

Last verified: May 26, 2026