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

THIOGLYCERIN

Safety grade: A

Thioglycerin is a chemical compound that contains sulfur and is used to break down hair structure. It works by weakening the bonds that hold hair together, making it easier to remove or reshape.

This ingredient is used in hair removal products and hair straightening treatments because it breaks down the protein structure of hair, allowing it to be dissolved, removed, or permanently straightened.

Graded using: COSING.

Last verified: May 26, 2026