Sodium Thiosulfate

Sodium Thiosulfate is an inorganic sulfur-containing salt that acts as a reducing agent and antioxidant in formulations. It's used to quench residual oxidizers, support product stability, and reduce discoloration in water-based systems.
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Ingredient Snapshot

Overview
An antioxidant salt that helps keep formulas from discoloring.
Category
Antioxidant
Type
Antioxidant

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

It helps keep products looking fresh and can reduce the impact of oxidation on skin during use, aiding in preserving formula clarity and sensory quality over time.

Uses In Skincare & Cosmetics

It's common in water-based serums, toners, and essences as a stabilizing antioxidant, and used in hair treatments and after-rinse products formulated to counter oxidative effects.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

It carries low irritation risk at typical cosmetic levels and is broadly considered safe in topical formulations. Rare sensitivity is possible; discontinue if redness or stinging occurs. No common cosmetic regulatory limits are noted.

Is Sodium Thiosulfate a Good Ingredient?

It rates Good as a well-established reducing agent that reliably stabilizes water-based formulas and offers antioxidant support, with good solubility and compatibility. It falls short of Great due to limited direct clinical evidence for meaningful skin outcomes in leave-on use.

Products with Sodium Thiosulfate

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