Ask KBeauty Verified™

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

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Named by what the crawler says it is; look-alikes we detect are counted under Others. Google · Gemini includes Googlebot, Google’s search crawler, whose index Google also uses for its AI features; other search engines and bots are in Others. AI visibility →

Dihydroxy-Indole

CAS 3131-52-0 ·

KR South Korea (MFDS)

No specific rule on file.

EU European Union (CosIng)

Restricted Annex III/207

Conditions: Product type: (a) Hair dye substance in oxidative hair dye products (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 0,5%

Required label warning: To be printed on the label: Hair colorants can cause severe allergic reactions.

Source: EU CosIng — Annex III · checked Oct 17, 2026

US United States (FDA)

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

Also listed as

DIHYDROXY-INDOLE

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 Dihydroxy-Indole banned in the European Union?

In the EU's CosIng records it is listed as “Restricted” (EU CosIng — Annex III). A restricted ingredient is allowed within the stated conditions.

Is Dihydroxy-Indole banned in South Korea?

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

Is Dihydroxy-Indole 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 the CAS number of Dihydroxy-Indole?

CAS 3131-52-0 (from official records).