10-undecenoic acid is an undecenoic acid having its double bond in the 10-position.
- Korean limit
- 0.2%
Definition
10-undecenoic acid is an undecenoic acid having its double bond in the 10-position. It is derived from castor oil and is used for the treatment of skin problems. It has a role as a plant metabolite and an antifungal drug. It is a conjugate acid of a 10-undecenoate.
Source: PubChem
US FDA substance register · UNII K3D86KJ24N · registered name Undecylenic Acid · single chemical substance
Undecylenic Acid is the aliphatic acid that conforms generally to the formula:
Cosmetic roles
Safety & regulatory references
- Restricted
- China · South Korea
- Allowed preservative
- United Kingdom
Source: MFDS (Korea) cosmetic regulatory information · ASEAN Cosmetic Directive · EU Cosmetics Regulation · Taiwan FDA cosmetic ingredients · UK cosmetics regulations (OPSS)
Argentina · Brazil
- Field of application and/or use : Products to combat dandruff.
- Maximum concentration permitted at final product : 2%
- Maximum concentration permitted at final product : 0.2% (expressed as acid)
ASEAN
- Maximum authorised concentration in the finished cosmetic product : 0.2% (acid)
Taiwan
- 0.2%
European Union
- Maximum concentration in ready for use preparation : 0.2% (as acid)
Source: MFDS (Korea) cosmetic regulatory information
Not classified under Korea’s toxic-substance GHS list · existing chemical substance
Restriction V/18 · Other restriction: ban substances that deplete the ozone layer
Source: EU CosIng ingredient list
Reviewed by CIR: Final Report: Safety Assessment of Fatty Acids and Fatty Acid Salts as Used in Cosmetics
More data — names, identifiers, properties, test records, literature
Official labels & definitions
JCIA labelling name ウンデシレン酸: 本品は、次の化学式で示される脂肪酸である。
Source: JCIA labelling names (Japan)
Names & identifiers
- CAS No.chemical registry number
- 112-38-9
- CAS No.chemical registry number
- 1333-28-4
- EC No.EU chemical inventory number
- 203-965-8
- EC No.EU chemical inventory number
- 215-583-9
- DTXSIDUS EPA chemical ID
- DTXSID8035001
- DTXCIDUS EPA compound ID
- DTXCID6015001
- IUPAC
- Undec-10-enoic acid
- Molecular formula
- C11H20O2
- Molecular weight
- 184.279 g/mol
Measured properties
- Appearance
- liquid
- Melting/freezing point
- 24.5 ℃
- Initial boiling point and range
- 300 ℃
- Flash point
- 146 ℃((COC))
- Vapour pressure
- 1 ㎜Hg((114 C))
- Relative density
- 0.910~0.913 ( (25 ℃))
- n-Octanol/water partition coefficient (Kow)
- 4
- Auto-ignition temperature
- 275 ℃
- Molecular weight
- 184.28
Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.
Source: KOSHA safety data sheets (Korea)
What products actually use it for
What the 21 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.
- Preservative5
- Surfactant (surface active agent)4
- Fragrance3
- Biocide2
- Cleaning agent2
- Emulsifier2
- Flavouring and nutrient2
- Intermediate1
Source: US EPA CompTox dashboard
Irritation and sensitisation studies
3 skin studies and 2 eye studies are on record.
The studies disagree (the most common conclusion covers 50%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.
See all 5 studies
- Severe Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to - Category 6.3A (Category 2)
Skin Irritation · Read Across - Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · according to OECD Guideline 406 (Skin Sensitisation) according to EU Method B.6 (Skin Sensitisation) - Category 6.4A (Category 2A)
Eye Irritation · Read Across - Severe Irritation
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) according to EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion) according to
Source: US EPA CompTox dashboard
Related literature
- Novel Formulation of Undecylenic Acid induces Tumor Cell Apoptosis · 2022
- A Novel Ammonium Carboxylate Salt of Undecylenic Acid for the Topical Treatment of Gram‐Positive and Antibiotic‐Resistant Skin Infections · 2025
- Molecular modeling and phenoloxidase inhibitory activity of arbutin and arbutin undecylenic acid ester. · 2021
- Ultrasound-Assisted Synthesis of Antimicrobial Inulin and Sucrose Esters with 10-Undecylenic Acid · 2021
- The Treatment of Dermatophytoses of the Glabrous Skin: A Comparison of Undecylenic Acid and its Salt Versus Tolnaftate · 1983
Linked databases 26
- ASEAN Cosmetic Directive
- Australian Industrial Chemicals Inventory (AICIS)
- ChEBI
- ChEMBL
- China inventory of existing ingredients (IECIC)
- EU CosIng ingredient list 2
- EU Cosmetics Regulation
- JCIA labelling names (Japan)
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- MFDS (Korea) cosmetic regulatory information 2 3 4
- NIST Chemistry WebBook
- PubChem
- Taiwan FDA cosmetic ingredients
- Tlooto literature search 2 3 4 5
- UK cosmetics regulations (OPSS)
- UniChem cross-reference IDs
- US Cosmetic Ingredient Review (CIR) 2
- US EPA CompTox dashboard 2
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
- Wikipedia · English · Japanese · Chinese