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C18-38 Alkyl C24-54 Acid Ester
AKA “C18-38 Alkyl C24-54 Acid Ester, Alkyl Ester”
Acid
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Ingredient Facts
C18-38 alkyl c24-54 acid ester
AKA: Alkyl Ester
Acid · Viscosity Controlling · EWG: 4
Synthetic
Acid
Not Clean
Fatty acids, C24-54, C18-38-alkyl esters
CAS #
223706-22-7
Form
Oil
State
Solid
See origin →
Functions
Viscosity Controlling
Controls Viscosity
Traditional Use
A synthetic long-chain ester created for modern cosmetic chemistry in the 20th century. Developed as a non-comedogenic emollient for premium skincare formulations.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Safety Assessment of Thiodipropionic Acid and its Dialkyl Esters as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
Safety Assessment of Alkyl Esters as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
C18-38 Alkyl C24-54 Acid Ester
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Crotonic Acid/Vinyl C8-12 Isoalkyl Esters/VA/Bis-Vinyldimethicone Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics.
Diamante C, Fiume MZ, Bergfeld WF, Belsito DV, Hill RA et al.
International journal of toxicology, 2010
→
Crotonic Acid/Vinyl C8-12 Isoalkyl Esters/VA/Bis-Vinyldimethicone Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Verified Jun 2026
Data: CosIng · EWG · CIR