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Antioxidant

ACETYL CYSTEINE

CAS 616-91-1 Updated
72

Safety score · 0–100

Fine

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

About

N-acetyl-L-cysteine, an antioxidant amino-acid derivative used at low % for free-radical defense. Bulk powder is mildly irritating, but in finished products at low % it is well tolerated.

Function

ANTIOXIDANTSKIN CONDITIONING

Skin benefits

  • Antioxidant precursor of glutathione
  • Helps neutralize reactive oxygen
  • Used in anti-pollution serums

Known concerns

  • Bulk material is GHS H315/H319/H335 irritating
  • Sulfur smell at higher %
  • Stability in formula needs care

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.