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Antioxidant

THIODIGLYCOLIC ACID

CAS 123-93-3 Updated
55

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A sulfur-bridged dicarboxylic acid used as a mild antioxidant and reducing agent. Limited cosmetic safety data and reactive thiol-like chemistry place it firmly in the use-with-awareness range.

Function

ANTIOXIDANTREDUCING

Skin benefits

  • Mild antioxidant action via thioether group
  • Reducing agent in perm/depilatory chemistry
  • Chelates trace metals

Known concerns

  • Limited cosmetic-specific safety data
  • Potential skin/eye irritant at higher concentrations
  • Sulfur-based reducing chemistry can damage hair if misused

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.