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KBeauty Verified™ — K-beauty checked against official records from Korea, the EU and the U.S.

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Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts)

Korean: 에티드로닉애씨드 및 그 염류(1-하이드록시에칠리덴-디-포스포닉애씨드 및 그 염류) · CAS 2809-21-4 ·

KR South Korea (MFDS)

Restricted MFDS restricted ingredients

Conditions (official MFDS text, Korean):
* 배합한도 : ∙ 두발용 제품류 및 두발염색용 제품류에 산으로서 1.5% ∙ 인체 세정용 제품류에 산으로서 0.2% ∙ 기타 제품에는 사용금지

Source: MFDS — cosmetic ingredient use restrictions · checked Oct 17, 2026

EU European Union (CosIng)

No specific rule on file.

US United States (FDA)

No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.

Other markets

How Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) is treated in 1 more market, from the overseas cosmetic regulation database compiled by Korea's MFDS. Always confirm with the regulator of that country before selling there.

Market	Status	Conditions
AS ASEAN (10 countries)	Restricted	MFDS summary (Korean): * 【Restrictions】 Field of application and/or use : (a) Hair-care (b) Soap * 제한 【사용 범위】 : (a) 헤어 케어 제품 (b)비누 * 【Restrictions】 Maximum authorised concentration in the finished cosmetic product : (a) 1.5% expressed as etidronic acid (b) 0.2% expressed as etidronic acid * 제한 【완제품에서 허용된 최대 농도】 :...

Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 17, 2026

Also listed as

Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) 에티드로닉애씨드 및 그 염류(1-하이드록시에칠리덴-디-포스포닉애씨드 및 그 염류)

Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.

Frequently asked questions

Is Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) banned in the European Union?

We found no specific rule for it in the EU's CosIng records. That is not an approval or a safety statement.

Is Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) banned in South Korea?

In Korea's MFDS records it is listed as “Restricted” (MFDS — cosmetic ingredient use restrictions). A restricted ingredient is allowed within the stated conditions.

Is Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) allowed in cosmetics in the U.S.?

We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.

What is Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts) called on Korean labels?

Korea's MFDS standard Korean name is 에티드로닉애씨드 및 그 염류(1-하이드록시에칠리덴-디-포스포닉애씨드 및 그 염류).

What is the CAS number of Etidronic acid and its salts (1-hydroxyethylidene- di-phosphonic acid and its salts)?

CAS 2809-21-4 (from official records).