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Chelating Agent

ETIDRONIC ACID

CAS 2809-21-4
70

Safety score · 0–100

Fine

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

A bisphosphonate chelating agent used to sequester metal ions and stabilize cosmetics. Safe at low % in rinse-off and leave-on; can irritate at higher concentrations.

Function

CHELATING

Skin benefits

  • Effective chelator — sequesters metals
  • Stabilizes products against oxidation
  • Improves preservative efficacy

Known concerns

  • Skin/eye irritation at higher %
  • Pharmaceutical use as bisphosphonate
  • Moderate aquatic concerns

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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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.