POTASSIUM TETRATHIONATE is graded A (Safe) by Expert·ING, based on COSING regulatory data.
POTASSIUM TETRATHIONATE
Safety grade: A
Potassium tetrathionate is a chemical compound containing sulfur that acts as a reducing agent. It helps prevent oxidation and can work to break chemical bonds in cosmetic formulations.
This ingredient is used in cosmetics as a reducing agent to help stabilize formulations, remove unwanted color or odor, and maintain product integrity by preventing oxidative degradation.
Graded using: COSING.
Last verified: May 26, 2026
Other Reducing ingredients
- SODIUM METABISULFITE — Grade B
- THIOGLYCERIN — Grade A
- STANNOUS CHLORIDE — Grade A**
- DIHYDROXYACETONE — Grade A
- SODIUM THIOSULFATE — Grade A
- GLUTATHIONE — Grade A
- THIOLACTIC ACID — Grade A
- SODIUM BISULFITE — Grade B**