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

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(R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin

Korean: (R)-4-하이드록시-3-(3-옥소-1-페닐부틸)-2-벤조피론; (R)-와파린 · CAS 5543-58-8 ·

KR South Korea (MFDS)

Prohibited MFDS prohibited ingredients

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 (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin is treated in 5 more markets, 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
CN China	Prohibited	—
AS ASEAN (10 countries)	Prohibited	—
CA Canada	Prohibited	—
BR Brazil	Prohibited	—
AR Argentina	Prohibited	—

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

Also listed as

(R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin (R)-4-하이드록시-3-(3-옥소-1-페닐부틸)-2-벤조피론; (R)-와파린

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 (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin 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 (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin banned in South Korea?

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

Is (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin 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 (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin called on Korean labels?

Korea's MFDS standard Korean name is (R)-4-하이드록시-3-(3-옥소-1-페닐부틸)-2-벤조피론; (R)-와파린.

What is the CAS number of (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; (R)-warfarin?

CAS 5543-58-8 (from official records).