Is (1-Hydroxyethylidene)diphosphonic acid and its salts restricted in EU cosmetics?

(1-Hydroxyethylidene)diphosphonic acid and its salts is restricted in EU cosmetics under Annex III with a maximum concentration of (a) 1.5% (as etidronic acid) (b) 0.2% (as etidronic acid).

Is (1-Hydroxyethylidene)diphosphonic acid and its salts restricted under the ASEAN Cosmetic Directive?

(1-Hydroxyethylidene)diphosphonic acid and its salts is restricted under the ASEAN Cosmetic Directive Annex III with a maximum concentration of (a) 1.5% expressed as etidronic acid (b) 0.2% expressed as etidronic acid.

What is the CAS number for (1-Hydroxyethylidene)diphosphonic acid and its salts?

The CAS number for (1-Hydroxyethylidene)diphosphonic acid and its salts is 2809-21-4.

Regulatory data is for reference only. Always verify with the official regulator before making formulation decisions. Last refreshed: 8/30/2026.

Ingredients/(1-Hydroxyethylidene)diphosphonic acid and its salts

(1-Hydroxyethylidene)diphosphonic acid and its saltsCAS 2809-21-4

EU CosIng III — restrictedASEAN III — restricted

Regulatory status

Source	Status	Annex / Details	Limit / Conditions	Last updated
EU CosIng	restricted	Annex III	(a) 1.5% (as etidronic acid) (b) 0.2% (as etidronic acid)	—
ASEAN	restricted	Annex III	(a) 1.5% expressed as etidronic acid (b) 0.2% expressed as etidronic acid	—

What this means

(1-Hydroxyethylidene)diphosphonic acid and its salts has regulatory signals in EU CosIng, ASEAN. Review the source links above for the official conditions and latest updates.

Common questions

Is (1-Hydroxyethylidene)diphosphonic acid and its salts restricted in EU cosmetics?: (1-Hydroxyethylidene)diphosphonic acid and its salts is restricted in EU cosmetics under Annex III with a maximum concentration of (a) 1.5% (as etidronic acid) (b) 0.2% (as etidronic acid).
Is (1-Hydroxyethylidene)diphosphonic acid and its salts restricted under the ASEAN Cosmetic Directive?: (1-Hydroxyethylidene)diphosphonic acid and its salts is restricted under the ASEAN Cosmetic Directive Annex III with a maximum concentration of (a) 1.5% expressed as etidronic acid (b) 0.2% expressed as etidronic acid.
What is the CAS number for (1-Hydroxyethylidene)diphosphonic acid and its salts?: The CAS number for (1-Hydroxyethylidene)diphosphonic acid and its salts is 2809-21-4.

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