Fragrance avoidance
Nothing to weigh for this context yet.
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.
- beauty
- industrial
1-Propanesulfonic acid, 3-mercapto-, monosodium salt
CAS 121039-94-9
Also registered as 3 other CAS numbers
137740-43-3 · 201027-81-8 · 17636-10-1
Concern score
Not assessed — no hazard data yet.
1-Propanesulfonic acid, 3-mercapto-, monosodium salt in plain language
On cosmetic ingredient lists it appears as “Sodium 3-MERCAPTOPROPANE sulfonate”.
Also known as Sodium 3-MERCAPTOPROPANE sulfonate · 1-Propanesulfonic acid, 3-mercapto-, sodium salt (1:1) · Sodium 3-MERCAPTO-1-PROPANESULFONATE · Sodium 3-sulfanylpropane-1-sulfonate · 3-mercapto-1-propanesulfonic acid sodium salt · 3-mercapto-1-propanesulphonic acid
Show all 17 names
Asta 7100 · Ec 241-620-3 · Sodium 3-?Mercapto-?1-?propanesulfonate (>90%) · Sodium 3-mercaptopropanesulphonate · Sodium 3-mercaptopropylsulfonate · Sodium gamma-mercaptopropanesulfonate · Sodium γ-mercaptopropanesulfonate · Sodium3-mercaptopropanesulphonate · sodium 3-mercaptopropane-1-sulfonate · sodium 3-mercaptopropanesulfonate · sodium mercapto propane sulfonate
Used in cosmetics as a hair conditioner, a ph adjusters and a surface modifier.
- Hair conditioning
- pH adjusters
- Surface modifier
- Denaturant
- We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.
Regulation
No restrictions found. 1-Propanesulfonic acid, 3-mercapto-, monosodium salt appears in these published regulatory listings.
- Found in consumer products
- Industrial
EUCosIngActiveSodium 3-Mercaptopropane Sulfonate is the organic compound that conforms to the formula:
- Sodium 3-Mercaptopropane Sulfonate is the organic compound that conforms to the formula:Source →
USEPAcommercial use observedEPA CPDat observed this chemical in 12 composition records across product categories including Specialty occupational products.
- EPA CPDat observed this chemical in 12 composition records across product categories including Specialty occupational products.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 1-Propanesulfonic acid, 3-mercapto-, monosodium salt. 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 1-Propanesulfonic acid, 3-mercapto-, monosodium salt yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Where this comes from
- Open →
CosIng
regulatory · updated 2026-09-23
- Open →
EPA Chemical and Products Database
exposure · updated 2019-02-27
- 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
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
No signal in this context
Where it has been recorded
How often EPA CPDat has listed 1-Propanesulfonic acid, 3-mercapto-, monosodium salt in a product composition. These are source records, not Greenveil catalog products.
Source records
12
Specialty occupational products
Typical roles
Hair conditioningpH adjustersSurface modifierDenaturant