CYSTEAMINE HCL is graded A (Safe) by Expert·ING, based on COSING regulatory data.
CYSTEAMINE HCL
Safety grade: A
Cysteamine HCl is a chemical compound derived from the amino acid cysteine that works as a reducing agent. It's primarily used in hair straightening and perming treatments to break down the natural bonds in hair so it can be reshaped.
This ingredient breaks down disulfide bonds in hair to enable straightening or waving, while also protecting the product and hair from oxidation damage.
Graded using: COSING.
Last verified: May 26, 2026
Other Antioxidant ingredients
- TOCOPHEROL — Grade A
- TOCOPHERYL ACETATE — Grade A
- BHT — Grade C**
- ASCORBYL PALMITATE — Grade A
- HYDROXYACETOPHENONE — Grade A
- PENTAERYTHRITYL TETRA-DI-T-BUTYL HYDROXYHYDROCINNAMATE — Grade A
- ASCORBIC ACID — Grade A
- CAMELLIA SINENSIS LEAF EXTRACT — Grade A