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UV Filter

CERIA/SILICA

CAS 243133-71-3
60

Safety score · 0–100

Fine

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

A nano-scale composite of cerium oxide and silica used as a UV-absorbing/scattering filter in sun care. Effective and photostable; nanoparticle inhalation risk drives caution in spray formats.

Function

UV ABSORBER

Skin benefits

  • UV-absorbing inorganic composite
  • Photostable
  • Adds matte finish in sun care

Known concerns

  • Nanoparticle inhalation risk in sprays
  • Cerium oxide — animal lung studies show inflammation
  • Limited long-term dermal data

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.