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

DITHIOTHREITOL

Dithiothreitol (DTT)

Safety grade: A

Dithiothreitol is a chemical compound that breaks down protein structures in hair. It works by cutting the strong chemical bonds that hold hair in its natural shape, allowing the hair to be restyled into waves or straightened.

This ingredient is used in hair permanent waving and straightening products to break down the disulfide bonds in hair proteins, making it possible to restructure the hair into a new desired shape.

Graded using: COSING.

Last verified: May 26, 2026