preservative
Phenethyl Alcohol
A naturally occurring fragrance-active alcohol with preservative function. Found in rose essential oil — its natural occurrence supports clean-beauty positioning. Dual role as rose-floral fragrance note and antimicrobial component.
Benefits
- Antimicrobial preservative — effective against bacteria and fungi
- Natural rose-floral fragrance note
- Accepted in COSMOS-certified formulations
- Solubiliser for fragrance components
- Mild humectant at higher concentrations
Example uses
- Vegan mascaras
- Natural COSMOS-certified products
- Floral fragrance-positioned skincare
- Eye formulas
- Lip products
Mechanism of action
Antimicrobial function via disruption of the bacterial cell membrane proton gradient — phenethyl alcohol intercalates into the phospholipid bilayer and dissipates the proton-motive force essential for bacterial ATP synthesis. The phenyl ring and ethanol tail create a dual hydrophilic-hydrophobic structure optimised for membrane integration.
Clinical evidence · Moderate
COSMOS-certified ingredient with established antimicrobial studies. Safety assessed by SCCS.
Effective concentration range
0.2–1% (preservative); trace in fragrance
Formulation notes
Effective pH 4–8. The fragrance note must be considered in the total fragrance system. Functions synergistically with other mild preservatives at sub-MIC concentrations.
Watchouts
EU fragrance allergen consideration applies — phenethyl alcohol contributes to total fragrance allergen load. At high concentrations, the fragrance note may be overpowering. Sensitisation risk is low but not absent.
Stacks with
Controversies & overclaims
Natural occurrence in rose oil does not prevent the preservative being synthetically produced for cosmetic use. The natural-fragrance narrative is accurate for the rose association but most cosmetic phenethyl alcohol is synthetically derived.
Market positioning
Marketed as natural rose-fragrance preservative. The rose association is accurate; the synthetic production route for the cosmetic ingredient is underreported.
Comedogenicity
0 / 5
Sensitisation risk
Low
INCI & aliases
Phenethyl Alcohol
phenylethanol · 2-phenylethanol · beta-phenylethyl alcohol · rose fragrance alcohol
Clean beauty perception
Accepted in COSMOS-certified natural cosmetics. The natural occurrence in rose oil strengthens clean-beauty narrative.
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