CYSTEAMINE
Ethanethiol, 2-amino- or Mercaptamine
CYSTEAMINE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.
Regulatory evidence by market
No rule for this ingredient has been imported for any of the 13 markets tracked here.
That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.
Chemical identity and properties
Cysteamine
Cysteamine is an amine that consists of an ethane skeleton substituted with a thiol group at C-1 and an amino group at C-2. It has a role as a geroprotector, a radiation protective agent, a mouse metabolite and a human metabolite. It is a thiol and an amine. It is functionally related to an ethylamine. It is a conjugate base of a cysteaminium. — ChEBI
- IUPAC name
- 2-aminoethanethiol
- Molecular formula
- C2H7NS
- Molecular weight
- 77.15 g/mol
- Exact mass
- 77.02992040 Da
- XLogP3
- -0.4
- Topological polar surface area
- 27.0 Ų
- Hydrogen-bond donors
- 2
- Hydrogen-bond acceptors
- 2
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
16 more reported names
External database identifiers
Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Inventory details for CYSTEAMINE
INCI name
CYSTEAMINE
Description
Ethanethiol, 2-amino-
or
Mercaptamine
Record provenance
- Inventory reference
- 95978
- Imported identity
- CYSTEAMINE
- Source update
- 23/04/2018
Annex records for CYSTEAMINE
Key data
- HAIR WAVING OR STRAIGHTENING
- Modifying the chemical structure of the hair, allowing it to be set in the style required (permanent waves or hair straightening).
Official EU ingredient-name evidence
The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.
Related inventory evidence
Ingredients with overlapping formulation functions
Additional official and scientific sources
11 external databases to check this identity in
Each link searches that source for this identity. What each source is, and its legal weight
How CYSTEAMINE appears in the CosIng inventory
The CosIng inventory lists CYSTEAMINE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.
CYSTEAMINE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.
Frequently asked questions
Source note for CYSTEAMINE
This page reproduces the CosIng inventory entry for CYSTEAMINE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.
Use this inventory page to research CYSTEAMINE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.
Tools & next steps
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