A reducing agent and antioxidant. It stabilizes the formula, supports brightening actives and limits oxidation. Well tolerated.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
A functional antioxidant and stabilizer. Safe at cosmetic levels.
Sodium thiosulfate (INCI: Sodium Thiosulfate) is a reducing agent and antioxidant used for technical purposes. In cosmetics it protects the formula from oxidation and stabilizes other ingredients, especially brightening actives that are sensitive to air. This is a functional component, not a skincare active. Its work centers on formula chemistry: it keeps certain ingredients from degrading and preserves the color and performance of the product. No visible treatment effect on the skin should be expected from it. Applied topically it has no systemic relevance, so it can be used during pregnancy and breastfeeding. Tolerance is good, with low irritation potential and low allergy risk, which makes it suitable for sensitive skin. At use levels it does not dry or clog pores. Its presence in a formula usually signals that the developer took care of the stability of the more delicate actives.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Sodium Thiosulfate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Sodium Thiosulfate suits: normal, dry, combination, oily, sensitive.
A reducing agent and antioxidant.
The INCI name is Sodium Thiosulfate. It may also appear as: Натрия тиосульфат.
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