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Sodium acetyl cysteinate

CAS 63664-54-0

Also registered as 2 other CAS numbers

444941-09-7 · 19542-74-6

Sodium acetyl cysteinate chemical structure

Concern score

Not assessed — no hazard data yet.

Sodium acetyl cysteinate in plain language

What it is

Also known as Acetylcysteine sodium · Sodium N-(1-carboxy-2-sulfanylethyl)ethanimidate · N-acetyl-l-cysteine sodium salt · sodium (2R)-2-acetamido-3-sulfanylpropanoate · Acetylcysteine GNR · Acetylcysteine sodium salt

Show all 16 names

Cinnamidopropyltrimonium acetylcysteinate · D07554 · L-cysteine, n-acetyl-, sodium salt · L-Cysteine, N-(1-hydroxyethylidene)-, sodium salt (1:1) · L-Cysteine, N-acetyl-, monosodium salt · Sodium N-Acetyl-Cysteinate · Sodium N-acetyl-L-cysteinate · UNII-NRD80R06FB · sodium N-acetylcysteinate · sodium;(2R)-2-acetamido-3-sulfanylpropanoate

What it does

Used in cosmetics as a UV filter, a skin-conditioning agent and an absorbent.

  • UV absorber
  • Skin conditioning
  • Absorbent
  • Conditioner
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. Sodium acetyl cysteinate appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Absorbent, UV stabilizer, Softener and conditioner.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Absorbent, UV stabilizer, Softener and conditioner.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Sodium acetyl cysteinate. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Sodium acetyl cysteinate yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated 2019-12-20

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

How often EPA CPDat has listed Sodium acetyl cysteinate in a product composition. These are source records, not Greenveil catalog products.

Named organisations

1

Typical roles

UV absorberSkin conditioningAbsorbentConditioner
See products using Sodium acetyl cysteinate →