Official EU label nameGlossary entry 7981
CYSTEINE HCl
This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.
Global evidence snapshot
The resolved identity has matching regulatory evidence in 1 of 13 indexed market datasets: 1 country records and 0 EU Annex records. Every result and evidence gap is listed below.
Markets checked
13
Markets with evidence
1
Evidence gaps
12
Resolved identifiers
5
Resolved substance identity
CAS:52-89-152-90-43374-22-9616-91-1
EC:200-157-7
Ingredient index records:
CYSTEINE HCL
Cosmetic functions: ANTIOXIDANT, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING, REDUCING
Cysteine hydrochloride
3 matched or reported names
CYSTEINE HCLcysteine hydrochloride시스테인, 아세틸시스테인 및 그 염류
Regulatory evidence in all 13 markets
Open each matched record for its scope, concentration, conditions, warnings and official source version.
Swipe or scroll horizontally to see dataset coverage and next actions.
| Market | Result | Records | Dataset | Meaning / next action |
|---|---|---|---|---|
| European Union EU | No local match | 0 | Complete annex dataset Regulation (EC) 1223/2009 consolidated to 1 May 2026 | No annex match only means that these five annexes did not return a match; CosIng identity data and other EU obligations still need review. |
| Great Britain GB | No local match | 0 | Complete consolidated annex dataset GB retained Regulation 1223/2009 schedules, effective 15 August 2026 | No annex match is not approval and does not cover Northern Ireland, which follows the applicable EU framework. |
| Canada CA | No local match | 0 | Complete Hotlist snapshot Health Canada Cosmetic Ingredient Hotlist, 13 August 2025 | The Hotlist is an administrative compliance tool, not an exhaustive safety approval list. |
| New Zealand NZ | No local match | 0 | Complete schedules dataset Cosmetic Products Group Standard schedules effective 1 January 2026 | The searchable spreadsheet is an aid; the legal Group Standard and incorporated notices remain authoritative. |
| ASEAN ASEAN | No local match | 0 | Complete regional annex dataset ASEAN Cosmetic Directive annexes 2026-1, 22 June 2026 | Regional annex coverage does not replace member-state implementation dates, notifications or national deviations. |
| China CN | No local match | 0 | Complete prohibited catalogues plus official-source workflow NMPA 2021 banned catalogues plus dynamic IECIC List I/List II system current since 2025 | IECIC listing is not blanket approval; absence may require the new cosmetic ingredient route, and restrictions are checked separately. |
| Japan JP | No local match | 0 | Complete Standards appendices dataset MHLW Standards for Cosmetics official English source and Japanese amendments checked for the imported snapshot | The Japanese text and subsequent notices are canonical; no local match is not a product-compliance conclusion. |
| South Korea KR | Restricted | 1Open record 1 | Complete current appendix dataset MFDS Notice 2026-19, effective 18 March 2026 | Review every linked record and exact conditions. |
| United States US | No local match | 0 | Complete enumerated federal ingredient rules eCFR Title 21 issue date 27 August 2026 | FDA has no general approved-cosmetic-ingredient catalogue; absence from these sections is not approval or proof of safety. |
| Australia AU | No local match | 0 | Complete cosmetic-relevant Poisons Standard subset plus official workflow Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026 | An AICIS Inventory match is not cosmetic approval; no Inventory match can indicate a new, exempted, reported or confidential introduction. |
| Brazil BR | No local match | 0 | Complete prohibited dataset plus current restricted-list workflow ANVISA RDC 1.029/2026 and RDC 1.030/2026, published 15 June 2026 | RDC 1.030/2026 amends rather than replaces the prohibited baseline, and the second restricted-list revision was still under consultation in July 2026. |
| India IN | No local match | 0 | Complete current Part 2 dataset plus official workflow for Parts 1, 3 and 4 Cosmetics Rules 2020 plus current BIS IS 4707 parts (1:2020, 2:2025, 3:2025, 4:2022) | The standards are separate controlled publications; absence from a locally indexed excerpt is not permission. |
| Saudi Arabia SA | No local match | 0 | Complete official list index SFDA live prohibited/restricted lists, snapshot 30 August 2026 | No list match is not permission; Gulf/SFDA product, claim, notification and technical requirements still apply. |
No market rows match this filter.
Matching market records and conditions
Chemical identity and properties
CAS 3374-22-9PubChem CID 594
DL-cysteine
Cysteine is a sulfur-containing amino acid that is propanoic acid with an amino group at position 2 and a sulfanyl group at position 3. It has a role as a fundamental metabolite. It is a polar amino acid, a sulfur-containing amino acid and an alpha-amino acid. It contains a sulfanylmethyl group. It is a conjugate base of a cysteinium. It is a conjugate acid of a cysteinate(1-). It is a tautomer of a cysteine zwitterion. — ChEBI
- IUPAC name
- 2-amino-3-sulfanylpropanoic acid
- Molecular formula
- C3H7NO2S
- Molecular weight
- 121.16 g/mol
- Exact mass
- 121.01974964 Da
- XLogP3
- -2.5
- Topological polar surface area
- 64.3 Ų
- Hydrogen-bond donors
- 3
- Hydrogen-bond acceptors
- 4
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
CYSTEINE, DL-5CM45Q5YAFNSC-63864RefChem:1083896222-160-2DL-Cystein(+/-)-2-Amino-3-mercaptopropionic acidNSC 63864
16 more reported names
ZysteinHcysd,l-cysteineUNII-5CM45Q5YAF[35s]cysteineCCRIS 85982-amino-3-sulfanyl-propanoic acidL-HSCH2CH(NH2)COOHCAS_5862DL-2-Amino-3-mercaptopropionic acidCS-W013566Tox21_111766_1H-Cys-OH HCl HOCAS-3374-22-9C3H7NO2SSR-01000944791
External database identifiers
- ChEBI:CHEBI:15356
- ChEMBL:CHEMBL54943
- EPA DTXSID:DTXSID5046988
- PubMed:23024785
- PubMed:22867025
- PubMed:22813754
- PubMed:22769850
- PubMed:22572786
- PubMed:22539321
- PubMed:22533155
- PubMed:22524145
- PubMed:22523489
- PubMed:22427952
- PubMed:22405311
- PubMed:22365687
Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
CAS 52-89-1PubChem CID 60960
Cysteine Hydrochloride
L-cysteine hydrochloride is a hydrochloride obtained by combining L-cysteine with one molar equivalent of hydrogen chloride. It has a role as a flour treatment agent, an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor and a human metabolite. It contains a L-cysteinium. — ChEBI
- IUPAC name
- (2R)-2-amino-3-sulfanylpropanoic acid;hydrochloride
- Molecular formula
- C3H8ClNO2S
- Molecular weight
- 157.62 g/mol
- Exact mass
- 156.9964274 Da
- Topological polar surface area
- 64.3 Ų
- Hydrogen-bond donors
- 4
- Hydrogen-bond acceptors
- 4
- Covalent units
- 2
- Defined stereocentres
- 1
Also known as
Cystein chlorideCysteine chlorhydratecysteine-hcl3-Mercaptoalanine hydrochlorideCysteine hydrochloride (anhydrous)CCRIS 3613Cysteine hydrochloride anhydrousNSC 8746
16 more reported names
EINECS 200-157-7WR 348UNII-A9U1687S1SEK 2367AI3-18781A9U1687S1SCysteine (as hydrochloride)CYSTEINE HYDROCHLORIDE, ANHYDROUSEC 200-157-7ELCYSNOURESSNSC-755898CYSTEINE HYDROCHLORIDE (II)CYSTEINE HYDROCHLORIDE ANHYDROUS (II)CYSTEINE HYDROCHLORIDE ANHYDROUS [II]CYSTEINE HYDROCHLORIDE (USP MONOGRAPH)
External database identifiers
- ChEBI:CHEBI:91247
- ChEMBL:CHEMBL1200630
- EPA DTXSID:DTXSID0020367
- PubMed:9107
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
CAS 52-90-4PubChem CID 5862
L-(+)-Cysteine
L-cysteine is an optically active form of cysteine having L-configuration. It has a role as a flour treatment agent, an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor and a human metabolite. It is a cysteine, a L-alpha-amino acid, a serine family amino acid and a proteinogenic amino acid. It is a conjugate base of a L-cysteinium. It is a conjugate acid of a L-cysteinate(1-). It is an enantiomer of a D-cysteine. It is a tautomer of a L-cysteine zwitterion. — ChEBI
- IUPAC name
- (2R)-2-amino-3-sulfanylpropanoic acid
- Molecular formula
- C3H7NO2S
- Molecular weight
- 121.16 g/mol
- Exact mass
- 121.01974964 Da
- XLogP3
- -2.5
- Topological polar surface area
- 64.3 Ų
- Hydrogen-bond donors
- 3
- Hydrogen-bond acceptors
- 4
- Covalent units
- 1
- Defined stereocentres
- 1
Also known as
L-cysteinecysteineCystein(R)-2-Amino-3-mercaptopropanoic acidThioserineHalf-cystinebeta-MercaptoalanineL-Cystein
16 more reported names
CysteinumL-CyscisteinaHalf cystine2-Amino-3-mercaptopropionic acidL-Alanine, 3-mercapto-FREE CYSTEINECisteinumFEMA No. 3263Cisteinum [Latin]NSC-8746alpha-Amino-beta-thiolpropionic acidL-2-Amino-3-mercaptopropionic acidbeta-Mercaptoalanine, L-(2R)-2-amino-3-mercaptopropanoic acidL Cysteine
External database identifiers
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
CAS 616-91-1PubChem CID 12035
N-Acetyl-L-Cysteine
N-acetyl-L-cysteine is an N-acetyl-L-amino acid that is the N-acetylated derivative of the natural amino acid L-cysteine. It has a role as a ferroptosis inhibitor, a geroprotector, an antioxidant, an antiinfective agent, an antiviral drug, a radical scavenger, a vulnerary, an antidote to paracetamol poisoning, a mucolytic and a human metabolite. It is a N-acetyl-L-amino acid, an acetylcysteine and a L-cysteine derivative. It is a conjugate acid of a N-acetyl-L-cysteinate. — ChEBI
- IUPAC name
- (2R)-2-acetamido-3-sulfanylpropanoic acid
- Molecular formula
- C5H9NO3S
- Molecular weight
- 163.20 g/mol
- Exact mass
- 163.03031432 Da
- XLogP3
- 0.4
- Topological polar surface area
- 67.4 Ų
- Hydrogen-bond donors
- 3
- Hydrogen-bond acceptors
- 4
- Covalent units
- 1
- Defined stereocentres
- 1
Also known as
acetylcysteineN-Acetylcysteinemercapturic acidAcetadoteL-AcetylcysteineFluimucetinRespaireN-Acetyl cysteine
16 more reported names
AcetilcisteinaBrunacAcetylcysteinumSyntemucolTixairNeo-fluimucilL-Cysteine, N-acetyl-Mucolyticum-LappeN-Acetyl-3-mercaptoalanineCysteine, N-acetyl-, L-N-Acetyl-L-(+)-cysteineMucolyticumCetylevMercapturic acid, (R)-MUCOSIL-20Fluatox
External database identifiers
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Additional authoritative substance research
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Official source and scope
Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.
Open official Decision