Science
Mechanism of Action
As an amphoteric molecule possessing both positive and negative charges, it lowers the surface tension of water to lift and emulsify sebum and debris. Beyond simple cleansing, it forms mixed micelles with anionic surfactants, physically preventing them from penetrating too deeply into the stratum corneum, thereby preserving the skin's structural integrity during the wash process.
Research
Clinical Evidence
High confidence0.25%
Key findings
- 01 A 4-week clinical study involving 24 human subjects confirmed no adverse reactions, irritation, or pigmentation changes at a 0.25% concentration.
- 02 Read-across clinical data on related sultaines indicates no sensitization at concentrations between 2.0% and 4.0%, though repeated exposure at 2.5% may cause minor, transient irritation in some subjects.
Transparency
Dusting Analysis
While often used at lower concentrations (0.25%) to boost foam aesthetics and safety profiles, it is rarely 'dusted' for marketing purposes because it lacks the consumer name recognition of botanical extracts. It is a functional ingredient where even low percentages provide measurable safety benefits.
The Formula
Formulation
Stability
Exhibits exceptional stability across a vast pH spectrum and remains effective in high-electrolyte or 'salty' environments without losing clarity.
Synergies
- Sodium Lauryl Sulfate (as an irritation mitigator)
- Anionic surfactants
- Cationic surfactants
- Electrolytes
Conflicts
- Generally compatible with all major surfactant classes.
Safety
Safety Profile
While the specific reported data for Capryl Sultaine points to 0.25%, the CIR recognizes the safety of similar sultaines at significantly higher concentrations (up to 11.5% in rinse-off applications).
Your Skin
Skin Compatibility
Our Assessment
Verdict
A high-precision functional ingredient that elevates the safety profile of cleansing formulations by shielding the skin barrier from surfactant-induced stress.
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