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Antioxidant

ETHYL CYSTEINATE HCL

CAS 868-59-7 (L-) Updated
80

Safety score · 0–100

Good

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

About

An ethyl ester of the antioxidant amino acid cysteine. Helps support the skin's natural sulfur-based antioxidant defenses, with the ester improving uptake versus free cysteine.

Function

SKIN PROTECTING

Skin benefits

  • Antioxidant support
  • Reinforces glutathione/cysteine pathways
  • Mild skin conditioning

Known concerns

  • Reactive thiol — possible sulfur odour
  • Limited cosmetic dossier

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.