Science
Mechanism of Action
Functions as an amphiphilic molecule where the lipophilic oleic acid tail integrates into oil droplets while the hydrophilic ammonium head remains in the aqueous phase, creating a protective interfacial film and electrostatic repulsion that prevents droplet coalescence and maintains emulsion stability.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 Stability testing at 3% concentration demonstrated consistent pH and texture maintenance in oil-in-water emulsions over extended periods
- 02 Clinical repeated insult patch testing of oleic acid derivatives at 1-13% concentrations showed no primary irritation or sensitization responses
Transparency
Dusting Analysis
Primarily used as a functional emulsifier and surfactant rather than a marketing ingredient, making dusting unlikely
The Formula
Formulation
Stability
Most stable under alkaline conditions around pH 9.8; reverts to oleic acid in acidic environments causing emulsion instability. HLB value approximately 17.
Conflicts
- Hard water (forms insoluble precipitates)
- Cationic surfactants
- Acidic ingredients below pH 7
- Strong oxidizing agents
Safety
Safety Profile
CIR Expert Panel concluded safety when formulated to be non-irritating, evaluated as part of fatty acids and fatty acid salts group
Your Skin
Skin Compatibility
Our Assessment
Verdict
A competent emulsifier with established safety but limited to specific pH ranges and primarily functional rather than skin-beneficial applications.
Related
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References
Sources
Keep exploring
From ingredients to everyday care.
Sensitive skin ↗
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