# Etidronic acid

URL: https://app.greenveil.ai/ingredients/ingredient_cas_2809_21_4
Categories: beauty, cleaning, industrial, pharma
Functions: Chelating agent, Corrosion inhibitor, Fragrance, Oxidizing agent, Processing aids not otherwise specified, Stabilizing agent
Identifier: 2809-21-4

> Etidronic acid is used as chelating agent / corrosion inhibitor. Greenveil chemical-concern score: 70/100 — High concern based on regulatory listings.. Assessed from 7 sources.

## Safety assessment

- Chemical concern score: 70/100 — High concern based on regulatory listings.
- Confidence: 4
- Rationale: (1-Hydroxyethylidene)diphosphonic acid and its salts is restricted in cosmetic products under Annex III of the EU Cosmetics Regulation (EC) 1223/2009.

## Regulatory status

- EU: restricted — Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Product types: (a) Hair product (b) Soap Maximum concentration: (a) 1.5% (as etidronic acid) (b) 0.2% (as etidronic acid)
- US: commercial use observed — EPA CPDat observed this chemical in 634 composition records across product categories including Furniture and furnishings, Specialty occupational products, Laboratory supplies. EPA CPDat classifies this chemical for functional uses including Chelating agent, Fragrance, Oxidizing agent.
- US: marketed drug occurrence — FDA NDC lists this ingredient in 1 active drug products and 1 total products.
- US: listed in openFDA substance — openFDA substance registry classifies this ingredient as chemical.

_Assessed by Greenveil._