Dimethiconol Cysteine
AKA “Silicone-Amino Acid Complex, Dimethiconol Cysteine
Synthetic
Ingredient Facts
Dimethiconol cysteine
AKA: Silicone-Amino Acid Complex
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Occlusive
Skin Conditioner
Hair Care
Amino Acid
Silicone
Synthetic
Clean
Dimethiconol Cysteine is the reaction product of dimethiconol and cysteine Science: Functions: Hair Conditioning Safety Ratings: CIR: Safe as used
Form
Powder
See origin →
Functions
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Conditions Hair
Softens and detangles hair
Traditional Use
A modern silicone-amino acid hybrid developed for cosmetics. Combines silicone's conditioning properties with cysteine, an amino acid important in skin structure, created to improve hair and skin conditioning in contemporary formulations.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR
Dimethiconol Cysteine — Duck Heart Ghost