Antimicrobial
UNDECYLENIC ACID
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A castor-derived fatty acid with antifungal action — long used in OTC athlete's foot products. Effective and well studied, but mildly irritating to skin and eyes.
Function
Skin benefits
- Antifungal — used in OTC athlete's foot products
- Mild antimicrobial preservative-booster
- FDA-approved active for fungal skin infections
Known concerns
- GHS skin and eye irritant
- Aquatic toxicity (H400/H412)
- Distinct fatty odor
- Can sting on broken skin
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related antimicrobials
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.