Science
Mechanism of Action
It exerts antimicrobial control by compromising the structural integrity of microbial cell membranes, leading to the leakage of vital intracellular components. Specifically, it inhibits fungal morphogenesis—the transition from yeast to invasive hyphal forms—while acting as a proton carrier to disrupt the internal pH gradient of fungal cells.
Research
Clinical Evidence
High confidence0.2%
Key findings
- 01 Health Canada/FDA OTC Monograph (21 CFR §333.210) established 10-25% as the therapeutic range for tinea pedis and diaper rash.
- 02 Alternative Medicine Review (Vol 7, No 1) identified a Minimum Inhibitory Concentration (MIC) of 0.02% (200 ppm) against Candida albicans at pH 6.0.
Transparency
Dusting Analysis
Given its potent Minimum Inhibitory Concentration of 0.02%, concentrations below this threshold are likely insufficient for microbial control and may be used for label positioning. However, in cosmetic applications, it is often restricted to 0.2% by regulation.
The Formula
Formulation
Stability
Practically insoluble in water; requires oil or hot alcohol for dissolution. Efficacy is highly pH-dependent, peaking at pH 6.0 and declining sharply in alkaline environments. Stable for 24 months when protected from light and moisture.
Synergies
- Antifungal agents
- Barrier-supporting lipids
- Acidic chelators
Conflicts
- Strong oxidizing agents
- Alkaline formulations (pH > 7.0)
Safety
Safety Profile
Cosmetic use is restricted to 0.2% (as acid) in the EU. In the US, it is recognized as an OTC antifungal active at much higher concentrations (up to 25% total undecylenates).
Your Skin
Skin Compatibility
Our Assessment
Verdict
An exceptionally reliable antimicrobial and antifungal agent that is well-tolerated across all skin types, provided it is formulated within a precise acidic pH range.
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References
Sources