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

SODIUM THIOSULFATE

Safety grade: A

Sodium thiosulfate is a salt compound commonly known for its use in photography and water treatment. In skincare, it works as a reducing agent that helps prevent unwanted chemical reactions and maintains product stability.

This ingredient acts as a reducing agent in cosmetics to protect other beneficial components from oxidation, helping preserve product efficacy and extending shelf life.

Graded using: COSING.

Last verified: May 26, 2026