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

CYSTEAMINE

Safety grade: A

A natural compound found in your body that helps break down and soften hair proteins, making it useful in hair straightening and smoothing treatments. It works by restructuring the bonds in hair to reduce frizz and create a smoother appearance.

Graded using: COSING.

Last verified: June 9, 2026