Sodium Thiosulfate ●
TL;DR. This ingredient is primarily a reducing agent and antioxidant, used to neutralize residual oxidants such as chlorine or peroxide and help stabilize formulas that are sensitive to oxidation.
What does Sodium Thiosulfate do in a cosmetic formula?
This ingredient is primarily a reducing agent and antioxidant, used to neutralize residual oxidants such as chlorine or peroxide and help stabilize formulas that are sensitive to oxidation.
Is Sodium Thiosulfate clean?
From a clean-beauty perspective, it is generally low-friction: it is not a common fragrance allergen, sensitizer, or clean-standard restricted material at typical cosmetic use levels. It can be mildly irritating in concentrated or very low-pH systems, so formulation context matters.
Is Sodium Thiosulfate sustainable?
This material is an inorganic salt made through industrial sulfur chemistry rather than plant sourcing. It does not create the same persistence concerns as many synthetic organic polymers or silicones, and it breaks down through normal sulfur-cycle pathways in water.
Is Sodium Thiosulfate COSMOS-approved?
It is generally compatible with COSMOS-natural and COSMOS-organic formulations when used as an allowed inorganic ingredient. Its Green Chemistry profile is mixed but acceptable: it is simple, water-soluble, and low-persistence, though not renewable in the plant-derived sense.
How does Sodium Thiosulfate work chemically?
The molecule is an inorganic oxy-sulfur salt with two sodium counterions and a divalent sulfur-oxygen anion, which gives it reducing behavior in water. It is typically used at low levels for stabilization or oxidant neutralization, is most stable around neutral to mildly alkaline pH, and can decompose under strongly acidic conditions or react with strong oxidizers.
Last updated 2026-05-13