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UNDECANOIC ACID.

Valuable CAS 112-37-8 / ANTI-SEBUM, CLEANSING, FRAGRANCE, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

Undecanoic Acid is a saturated fatty acid with an 11-carbon chain, sometimes referred to as Hendecanoic Acid. It is valued in skincare for its potential mild antimicrobial properties, particularly against fungi, and its role as a skin-conditioning and emollient agent.

Antimicrobial Antifungal Skin Conditioning Emollient

Science

This fatty acid is believed to exert its mild antimicrobial effects by disrupting the cell membranes of certain microorganisms, especially fungi, thereby compromising their structural integrity and inhibiting their growth. Furthermore, as a component of the lipid matrix, it can contribute to the skin's barrier function, offering emollient and conditioning benefits.


Research

Medium confidence
Effective range 0.5–2%
Optimal

N/A


Transparency

Not commonly dusted

While it provides general skin conditioning benefits at lower levels, its specific antimicrobial attributes often necessitate concentrations within an effective range for tangible claims, reducing the likelihood of 'dusting' for marketing purposes.


The Formula

Solubility
Oil
Optimal pH 4 – 7
0 7 14

Stability

As a saturated fatty acid, Undecanoic Acid exhibits good stability against oxidative degradation. It is generally stable across typical cosmetic pH ranges and temperatures encountered during formulation and product shelf-life.

Synergies

  • Other barrier-supporting lipids (e.g., ceramides, cholesterol, linoleic acid)
  • Antifungal agents for enhanced efficacy
  • Humectants (e.g., glycerin) for comprehensive hydration

Safety

CIR Status
Generally considered safe for cosmetic use, consistent with other saturated fatty acids.
Pregnancy
Safe
Sensitization risk Low

Topical application of Undecanoic Acid is typically well-tolerated. It is not commonly associated with significant irritation or sensitization reactions in cosmetic formulations at standard usage levels.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

Undecanoic Acid is a valuable ingredient, particularly beneficial for formulations designed to support skin's microbial balance and overall health, owing to its mild antimicrobial efficacy and excellent skin compatibility.


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