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

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1,2,4-Trihydroxybenzene

Korean: 1,2,4-트라이하이드록시벤젠 · CAS 533-73-3 · Functions: hair dyeing

KR South Korea (MFDS)

Prohibited MFDS prohibited ingredients

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

EU European Union (CosIng)

Prohibited Annex II/1642

Source: EU CosIng — Annex II · 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.

Other markets

How 1,2,4-Trihydroxybenzene 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)	Prohibited only in certain forms or uses	when used as a substance in hair and eyelash dye products

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

Also listed as

1,2,4-TRIHYDROXYBENZENE 1,2,4-트라이하이드록시벤젠

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 1,2,4-Trihydroxybenzene banned in the European Union?

In the EU's CosIng records it is listed as “Prohibited” (EU CosIng — Annex II).

Is 1,2,4-Trihydroxybenzene banned in South Korea?

In Korea's MFDS records it is listed as “Prohibited” (MFDS — cosmetic ingredient use restrictions).

Is 1,2,4-Trihydroxybenzene 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 1,2,4-Trihydroxybenzene used for in cosmetics?

The EU's CosIng inventory lists its functions as: hair dyeing.

What is 1,2,4-Trihydroxybenzene called on Korean labels?

Korea's MFDS standard Korean name is 1,2,4-트라이하이드록시벤젠.

What is the CAS number of 1,2,4-Trihydroxybenzene?

CAS 533-73-3 (from official records).