CYSTEINE
CYSTEINE is a cosmetic ingredient classified as Antioxidant. Also known as CAS 52-90-4. It is regulated in 2 markets including South Korea, Taiwan.
Also Known As
- CAS Number
- 52-90-4, 3374-22-9
Market Overview — 29 Markets
Detailed Regulations
EuropeNo restrictions
No specific restrictions for CYSTEINE in European Union, United Kingdom.
AmericasNo restrictions
No specific restrictions for CYSTEINE in United States, California, Maryland, Washington, Canada, Brazil.
East Asia & Oceania2 regulations
- Chemical name
- Cysteine
- Conditions of use
- * 배합한도 : 퍼머넌트웨이브용 제품에 시스테인으로서 3.0~7.5% (다만, 가온2욕식 퍼머넌트웨이브용 제품의 경우에는 시스테인으로서 1.5～5.5%, 안정제로서 치오글라이콜릭애씨드 1.0%를 배합할 수 있으며, 첨가하는 치오글라이콜릭애씨드의 양을 최대한 1.0%로 했을 때 주성분인 시스테인의 양은 6.5%를 초과할 수 없다)
Source: MFDS Korea Cosmetics Regulation
- Chemical name
- L-Cysteine/ DL-Cysteine/ L-Cysteine hydrochloride/ DL-Cysteine hydrochloride/ L-Cysteine monohydrochloride/ N-Acetyl-L-Cysteine
- CAS
- 52-90-4/ 3374-22-9/ 52-89-1/ 10318-18-0/ 7048-04-6/ 616-91-1
- Max concentration
- (a)7.5% (以cysteine計) (b)5.5% (以cysteine計)
- Product type
- (a)Permanent Hair waving or straightening products - Cold (b)Permanent Hair waving or straightening products - Tepid
- Conditions of use
- (a)pH：8.0-9.5； Alkalinity: The amount of the 0.1 N hydrochloric acid volumetric solution consumed is not more than 12 mL per mL of the sample. (b)pH：4.0-9.5； Alkalinity: The amount of the 0.1 N hydrochloric acid volumetric solution consumed is not more than 9 mL per mL of the sample.
Source: TFDA Cosmetics Regulations
ASEANNo restrictions
No specific restrictions for CYSTEINE in Singapore, Malaysia, Thailand, Indonesia, Vietnam, Philippines.
GCCNo restrictions
No specific restrictions for CYSTEINE in UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain.
EAEUNo restrictions
No specific restrictions for CYSTEINE in Russia, Belarus, Kazakhstan, Armenia, Kyrgyzstan.
Frequently Asked Questions
Is CYSTEINE banned in any country?
CYSTEINE is not banned in any of the 26 markets tracked by Formpli. However, it may be subject to restrictions or conditions of use in some markets.
What are the restrictions on CYSTEINE in cosmetics?
CYSTEINE is restricted or has conditions of use in South Korea, Taiwan. Restrictions may include maximum concentration limits, product type limitations, or mandatory labeling requirements. See the detailed regulations above for specifics.
Can I use CYSTEINE in cosmetics?
CYSTEINE is regulated in 2 markets. It has restrictions in South Korea, Taiwan. Use Formpli's free screening tool to check your full ingredient list against all 26 markets at once.
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Check Ingredients FreeThis information is for reference only and does not constitute legal or regulatory advice. Regulations change — always verify with official sources and consult a regulatory specialist before exporting cosmetic products. Data sourced from EU COSING, US FDA, Health Canada, MHLW Japan, MFDS Korea, ASEAN ACD, GCC SFDA, TGA Australia, ANVISA Brazil, EAEU TR CU, and Taiwan TFDA.