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Opacifying

ALUMINUM HYDROXIDE

CAS 21645-51-2 Updated
80

Safety score · 0–100

Good

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

About

An inert mineral used to coat sunscreen pigments and as an opacifier. Sits on the skin surface — no meaningful absorption.

Function

SKIN CONDITIONING - EMOLLIENT, HUMECTANT, OPACIFYING, SKIN PROTECTING, VISCOSITY CONTROLLING

Skin benefits

  • Coats pigments in sunscreens
  • Opacifier/bulker
  • Inert mineral
  • Reduces photocatalytic activity of TiO2

Known concerns

  • Respirable dust concern in manufacturing only
  • No meaningful skin penetration

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.