(1-Hydroxyethylidene)diphosphonic acid and its salts
Other
Moderate
CAS Number: 2809-21-4
About (1-Hydroxyethylidene)diphosphonic acid and its salts
Etidronic acid — a chelating agent that prevents discoloration in cosmetics. Corrosive at high concentrations but safe within EU limits.
Detailed Analysis
Etidronic acid (HEDP) is a bisphosphonate chelating agent that sequesters metal ions to prevent oxidation and discoloration in formulations. It is restricted to 1.5% (in hair dyes) or 0.2% (in other products) as etidronic acid. GHS classifications include H302 (harmful if swallowed), H314 (severe burns), and H318 (serious eye damage) for the neat material. At regulated cosmetic concentrations, it is generally safe.
Known Concerns
- ⚠ Corrosive at full strength (H314)
- ⚠ Harmful if swallowed (H302)
- ⚠ Serious eye damage (H318)
- ⚠ EU concentration limits apply
Safety Score
Moderate
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
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