C20-24 Alkyl Dimethicone
AKA “C20-24 Alkyl Dimethicone, Silicone, Alkyl Silicone”
Skin Conditioning
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Ingredient Facts
C20-24 alkyl dimethicone
AKA: Silicone, Alkyl Silicone
Skin Conditioning · Skin Conditioning · EWG: 2
Synthetic
Skin Conditioner
Silicone
Clean
Siloxanes and Silicones, C20-24 alkyl methyl, dimethyl
CAS #
200074-76-6
Form
Liquid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Viscosity Controlling
Locks in moisture
Traditional Use
Developed in the late 20th century as a silicone derivative for cosmetics. Used to create smooth textures and improve spreadability in skincare and makeup formulations.
Skin Types
●all-skin-types, gentle
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
ewg-2
medical-approval
pregnancy-nursing-safe
all-shades-safe
Regulatory Agencies
Structural Similarity-Induced Inter-Component Interaction in Silicone Polymer-Based Composite Sunscreen Film for Enhanced UV Protection.
Chen Y, Xu H, Liu Y, Fu Q, Zhang P et al.
Polymers, 2024
Structural Similarity-Induced Inter-Component Interaction in Silicone Polymer-Based Composite Sunscreen Film for Enhanced UV Protection.
Chen Y, Xu H, Liu Y, Fu Q, Zhang P et al.
Polymers, 2024
Structural Similarity-Induced Inter-Component Interaction in Silicone Polymer-Based Composite Sunscreen Film for Enhanced UV Protection.
Chen Y, Xu H, Liu Y, Fu Q, Zhang P et al.
Polymers, 2024
Structural Similarity-Induced Inter-Component Interaction in Silicone Polymer-Based Composite Sunscreen Film for Enhanced UV Protection.
Chen Y, Xu H, Liu Y, Fu Q, Zhang P et al.
Polymers, 2024
Structural Similarity-Induced Inter-Component Interaction in Silicone Polymer-Based Composite Sunscreen Film for Enhanced UV Protection.
Chen Y, Xu H, Liu Y, Fu Q, Zhang P et al.
Polymers, 2024
Safety Assessment of Polysilicone-11 as Used in Cosmetics.
Cherian P, Bergfeld WF, Belsito DV, Cohen DE, Klaassen CD et al.
International journal of toxicology, 2024
Safety Assessment of Polysilicone-11 as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
C20-24 Alkyl Dimethicone
European Commission
EU Cosmetic Ingredient Database (CosIng)
Polysilicone-11
European Commission
EU Cosmetic Ingredient Database (CosIng)
C20-24 Alkyl Dimethicone
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Polysilicone-11
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Addressing the Structural Organization of Silicone Alternatives in Formulations by Molecular Dynamics Simulations and a Novel Equilibration Protocol.
Ferreira T, Loureiro A, Noro J, Cavaco-Paulo A, Castro TG
Polymers, 2023
Effects of silicone emulsifiers on in vitro skin permeation of sunscreens from cosmetic emulsions.
Montenegro L, Paolino D, Puglisi G
Journal of cosmetic science, 2004
Design and Characterization of Silicone and Surfactant Based Systems for Topical Drug Delivery.
Oyafuso MH, Carvalho FC, Chiavacci LA, Gremião MP, Chorilli M
Journal of nanoscience and nanotechnology, 2015
Design and Characterization of Silicone and Surfactant Based Systems for Topical Drug Delivery.
Oyafuso MH, Carvalho FC, Chiavacci LA, Gremião MP, Chorilli M
Journal of nanoscience and nanotechnology, 2015
Verified Jun 2026
Data: CosIng · EWG · CIR