MERCAPTOPROPIONIC ACID
3-Mercaptopropionic acid
MERCAPTOPROPIONIC ACID 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
3-Mercaptopropionic Acid
3-mercaptopropanoic acid is a mercaptopropanoic acid that is propanoic acid carrying a sulfanyl group at position 3. It has a role as an algal metabolite. It is a conjugate acid of a 3-mercaptopropionate. — ChEBI
- IUPAC name
- 3-sulfanylpropanoic acid
- Molecular formula
- C3H6O2S
- Molecular weight
- 106.15 g/mol
- Exact mass
- 106.00885060 Da
- XLogP3
- 0.4
- Topological polar surface area
- 38.3 Ų
- Hydrogen-bond donors
- 2
- Hydrogen-bond acceptors
- 3
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
16 more reported names
External database identifiers
- ChEBI:CHEBI:44111
- ChEMBL:CHEMBL358697
- EPA DTXSID:DTXSID8026775
- PubMed:35151785
- PubMed:29852215
- PubMed:23061093
- PubMed:23044269
- PubMed:23041923
- PubMed:22967523
- PubMed:22965623
- PubMed:22957789
- PubMed:22922532
- PubMed:22898753
- PubMed:22881121
- PubMed:22842393
Evidence from additional scientific databases
EMBL-EBI ChEBI
3-mercaptopropanoic acid
A mercaptopropanoic acid that is propanoic acid carrying a sulfanyl group at position 3.
- Formula
- C3H6O2S
- Average mass
- 106.146 g/mol
- Monoisotopic mass
- 106.00885 Da
- Formal charge
- 0
- mercaptopropanoic acid — is a (CHEBI:47871)
- algal metabolite — has role (CHEBI:84735)
- algal metabolite — has role (CHEBI:84735)
- mercaptopropanoic acid — is a (CHEBI:47871)
- 3-mercaptopropionate — is conjugate acid of (CHEBI:86386)
Additional curated names
Cross-references from this source
- REGISTRY_NUMBER: 101294 — Gmelin
- REGISTRY_NUMBER: 773807 — Reaxys
- CAS: 107-96-0 — NIST Chemistry WebBook
- CAS: 107-96-0 — ChemIDplus
- MANUAL_X_REF: CPD-7673 — MetaCyc
- MANUAL_X_REF: HMDB0041604 — HMDB
- MANUAL_X_REF: MPT — PDBeChem
Mapped by: Exact CAS cross-reference in the ChEBI compound record. Source updated: 2015-07-09. Retrieved: 2026-08-31. Open source record
NIH PubChem PUG-View
Attributed physical-property, hazard, environmental and use annotations.
- Boiling Point: 111 °C AT 15 MM HG Source: Hazardous Substances Data Bank (HSDB)
- Boiling Point: 110.00 to 111.00 °C. @ 15.00 mm Hg Source: Human Metabolome Database (HMDB)
- Boiling Point: 110-111 °C (15 mmHg) Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Color/Form: CLEAR LIQUID Source: Hazardous Substances Data Bank (HSDB)
- Color/Form: AMORPHOUS CRYSTALS Source: Hazardous Substances Data Bank (HSDB)
- Density: 1.218 AT 21 °C Source: Hazardous Substances Data Bank (HSDB)
- Density: 1.220-1.226 (20 °C) Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Density: 1.218 @ 21°C Source: PAC Chemical Database, U.S. Department of Energy
- Dissociation Constants: PKA: 4.34 Source: Hazardous Substances Data Bank (HSDB)
- Flash Point: 93 °C Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- LogP: 0.430 Source: Human Metabolome Database (HMDB)
- Melting Point: 16.8 °C Source: Hazardous Substances Data Bank (HSDB)
- Melting Point: 16.8 °C Source: Human Metabolome Database (HMDB)
- Odor: STRONG & ACRID, SULFIDE LIKE ODOR Source: Hazardous Substances Data Bank (HSDB)
- Physical Description: Liquid Source: EPA Chemical Data Reporting (CDR)
- Physical Description: Clear liquid or solid; [HSDB] Colorless liquid with a stench; mp = 17-19 deg C; [MSDSonline] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Physical Description: Liquid Source: Human Metabolome Database (HMDB)
- Physical Description: Clear colourless to pale yellow oily liquid; Roasted sulphureous aroma Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Refractive Index: INDEX OF REFRACTION: 1.4911 AT 20 °C/D Source: Hazardous Substances Data Bank (HSDB)
- Refractive Index: 1.490-1.496 Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Solubility: SOL IN WATER, ALCOHOL, BENZENE, & ETHER Source: Hazardous Substances Data Bank (HSDB)
- Solubility: Soluble Source: Human Metabolome Database (HMDB)
- Solubility: Practically insoluble or insoluble in water Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Solubility: Soluble (in ethanol) Source: Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Vapor Pressure: 0.04 [mmHg] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Note: This chemical does not meet GHS hazard criteria for 3.8% (36 of 942) of reports. Source: European Chemicals Agency (ECHA)
- Signal: Danger Source: European Chemicals Agency (ECHA)
- GHS Hazard Statements: H290 (76.4%): May be corrosive to metals [Warning Corrosive to Metals]; H301 (96.2%): Toxic if swallowed [Danger Acute toxicity, oral]; H311 (10.2%): Toxic in contact with skin [Danger Acute toxicity, dermal]; H314 (95.9%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H318 (76.4%): Causes serious eye damage [Danger Serious eye damage/eye irritation]; H332 (77.7%): Harmful if inhaled [Warning Acute toxicity, inhalation] Source: European Chemicals Agency (ECHA)
- Precautionary Statement Codes: P234, P260, P261, P262, P264, P264+P265, P270, P271, P280, P301+P316, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P361+P364, P363, P390, P405, P406, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
- ECHA C&L Notifications Summary: Aggregated GHS information provided per 942 reports by companies from 16 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 36 of 942 reports by companies.; There are 15 notifications provided by 906 of 942 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
- Signal: Danger Source: NITE-CMC
- GHS Hazard Statements: H301: Toxic if swallowed [Danger Acute toxicity, oral]; H314: Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]; H332: Harmful if inhaled [Warning Acute toxicity, inhalation]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure] Source: NITE-CMC
- Precautionary Statement Codes: P260, P261, P264, P264+P265, P270, P271, P280, P301+P316, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P308+P316, P316, P317, P319, P321, P330, P363, P403+P233, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
- Consumer Uses: Plasticizer Source: EPA Chemical Data Reporting (CDR)
- Industry Uses: Plasticizer; Chain transfer agent Source: EPA Chemical Data Reporting (CDR)
- Sources/Uses: Used as a stabilizer, antioxidant, catalyst, chemical intermediate, and experimental convulsant agent; [HSDB] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Uses: STABILIZER; ANTIOXIDANT; CATALYST; CHEMICAL INTERMEDIATE Source: Hazardous Substances Data Bank (HSDB)
- Uses: HAS BEEN TRIED IN COLD-WAVE PREPARATIONS Source: Hazardous Substances Data Bank (HSDB)
- Uses: AS EXPERIMENTAL CONVULSANT AGENT Source: Hazardous Substances Data Bank (HSDB)
- Uses: CHEM INT FOR 3,3'-THIODIPROPIONIC ACID-MAY BE UNISOLATED Source: Hazardous Substances Data Bank (HSDB)
- Uses: For more Uses (Complete) data for 3-MERCAPTOPROPIONIC ACID (8 total), please visit the HSDB record page. Source: Hazardous Substances Data Bank (HSDB)
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| EMBL-EBI ChEBI | Exact match | 2026-08-31 |
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
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 MERCAPTOPROPIONIC ACID
INCI name
MERCAPTOPROPIONIC ACID
Description
3-Mercaptopropionic acid
Record provenance
- Inventory reference
- 35237
- Imported identity
- MERCAPTOPROPIONIC ACID
- Source update
- 15/10/2010
Annex records for MERCAPTOPROPIONIC ACID
Key data
- DEPILATORY
- Breaking down the mechanical strength of hair fibers so that they can be removed by mild scraping/rubbing.
- 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).
- REDUCING
- Changing the chemical nature of another ingredient by adding hydrogen (or removing oxygen).
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 MERCAPTOPROPIONIC ACID appears in the CosIng inventory
The CosIng inventory lists MERCAPTOPROPIONIC ACID 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.
MERCAPTOPROPIONIC ACID is also tagged with 3 cosmetic functions 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 MERCAPTOPROPIONIC ACID
This page reproduces the CosIng inventory entry for MERCAPTOPROPIONIC ACID 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 MERCAPTOPROPIONIC ACID 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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