UNDECANOIC ACID

Surfactant

78

Good

CAS Number: 112-37-8

About UNDECANOIC ACID

An odd-chain fatty acid with natural antifungal properties — used as a gentle cleanser and anti-sebum agent in skincare.

Detailed Analysis

Undecanoic acid (undecylenic acid's saturated counterpart, C₁₁H₂₂O₂, CAS 112-37-8) is a medium-chain fatty acid used as a cleansing surfactant, anti-sebum agent, and fragrance ingredient. It has documented antifungal properties and has been used medicinally to treat fungal skin infections. As a naturally occurring fatty acid, its safety profile is generally favorable, though it can cause mild skin irritation at higher concentrations. It appears in EU Annex lists related to ozone-depleting substances (generic ban, not specific to the ingredient).

What It Does

ANTI-SEBUM CLEANSING SURFACTANT - EMULSIFYING FRAGRANCE SURFACTANT - CLEANSING

Skin Benefits

  • ✓ Natural antifungal activity
  • ✓ Anti-sebum properties — helps control oiliness
  • ✓ Effective gentle cleansing

Known Concerns

  • ⚠ Mild skin irritant at higher concentrations
  • ⚠ May cause dryness with prolonged use as a surfactant

Safety Score

78

Good

Based on EU regulatory data, published safety research, and ingredient function analysis.

References

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EU CosIng Database

European Commission cosmetic ingredient registry

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This information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.