Science
Mechanism of Action
This ingredient functions by significantly lowering the surface tension of water, facilitating the disruption and removal of unwanted substances. Its molecular structure incorporates both hydrophilic and hydrophobic domains, enabling it to effectively attract, suspend, and emulsify dirt, oils, and environmental pollutants, which are then easily rinsed away. It provides strong wetting, detergency, and emulsifying properties.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Clinical observations indicate its utility as a cleansing agent across a concentration range of 4% to 30%, with higher concentrations typically reserved for products requiring more intensive cleansing action.
Transparency
Dusting Analysis
Sodium C16 Olefin Sulfonate is a primary functional ingredient, integrated at substantial concentrations as a key surfactant for its cleansing properties, rather than being added as a 'dusted' active ingredient at trace levels.
The Formula
Formulation
Stability
This ingredient exhibits remarkable stability across a wide pH range, specifically between 3 and 10. Its sulfonate groups, covalently bonded to carbon, grant it superior hydrolytic stability, particularly in acidic conditions where sulfate-based surfactants often degrade below pH 4. It also maintains high performance and integrity in the presence of hard water.
Safety
Safety Profile
The CIR Expert Panel has deemed sodium α-olefin sulfonates, including C14-16, safe for use in rinse-off products and safe up to 2% in leave-on products. This safety assessment is contingent upon strict adherence to impurity limits for gamma sultones (≤10 ppm for saturated, ≤1 ppm for chlorosultones, and ≤0.1 ppm for unsaturated sultones). It is poorly absorbed through intact skin, though absorption may increase if the skin barrier is compromised. While its general sensitization risk is considered low (supported by its inclusion on the EPA's Safer Choice list and an EWG score of 1), its irritancy potential is medium. Studies report moderate ocular irritation at concentrations ≥5%, escalating to significant irritation at ≥10%. Dermal irritation profiles are mixed, with a 1% aqueous solution predicted to be irritating and high concentrations (38-40% active) eliciting variable dermal responses.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium C16 Olefin Sulfonate is a valuable and efficacious cleansing surfactant, optimally utilized in rinse-off formulations for normal to oily skin, though its medium irritancy and comedogenicity necessitate precise formulation and controlled concentration to mitigate potential adverse effects.
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References
Sources