THIOHISTIDINE is graded A (Safe) by Expert·ING, based on COSING regulatory data.
THIOHISTIDINE
Safety grade: A
Thiohistidine is a modified amino acid (a building block of proteins) that contains sulfur. It's a laboratory-created compound designed to protect skin and products from oxidative damage and discoloration.
This ingredient protects cosmetic products and skin from oxidation and unwanted discoloration while also binding to metal impurities that could compromise product stability and appearance.
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