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

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N-Acetyl-L-Cysteine

Korean: N-아세틸-L-시스테인 · CAS 616-91-1 ·

KR South Korea (MFDS)

No specific rule on file.

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 N-Acetyl-L-Cysteine 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
JP Japan	Restricted	MFDS summary (Korean): * 【100g당 최대 배합량 (점막에 사용하지 않고 씻어내는 화장품 -Cosmetics not used for mucosa and to be washed away)】 : 9.0 g * 【100g당 최대 배합량 (점막에 사용하지 않고 씻어내지 않는 화장품 - Cosmetics not used for mucosa and not to be washed away)】 : 9.0 g * 【100g당 최대 배합량 (점막에 사용하는 화장품 - Cosmetics that may be used for mucosa)】 : * 단서조항 :

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

Also listed as

N-Acetyl-L-Cysteine N-아세틸-L-시스테인

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 N-Acetyl-L-Cysteine 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 N-Acetyl-L-Cysteine 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 N-Acetyl-L-Cysteine 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 N-Acetyl-L-Cysteine called on Korean labels?

Korea's MFDS standard Korean name is N-아세틸-L-시스테인.

What is the CAS number of N-Acetyl-L-Cysteine?

CAS 616-91-1 (from official records).