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Preservative

THIMEROSAL

CAS 54-64-8
3

Safety score · 0–100

Avoid

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

A mercury-based preservative banned for cosmetic use in the EU. Historically used in eye products and vaccines; classified as an environmental and neurotoxic hazard.

Function

PRESERVATIVE

Skin benefits

  • Historical use as antimicrobial preservative in eye-area products

Known concerns

  • Organomercury compound — EU Annex II banned in cosmetics
  • Acute toxicity, neurotoxicity, aquatic hazard
  • Strong skin sensitiser

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, so always read the physical product label and consult a healthcare professional for personal concerns.