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Chelating Agent

(1-Hydroxyethylidene)diphosphonic acid and its salts

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.

HEDP (etidronic acid) — a phosphonate chelator that locks up metal ions and stabilises peroxides. Common in shampoos and oxidative dyes; salts are well tolerated at neutral pH.

Skin benefits

  • Excellent chelator
  • Stabilises peroxide systems
  • Improves preservation efficacy

Known concerns

  • Acidic — eye / skin irritation as concentrate
  • Environmental persistence
  • Use neutralised salt at proper pH

References

EU

EU CosIng database

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

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TETRASODIUM BIS-(DICARBOXYCYCLOHEXANE AMIDOPROPYL) DIETHYLENE GLYCOL
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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.