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Moumoujus

BUTOXYNOL-5 CARBOXYLIC ACID.

Optional CAS 104909-82-2 / CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

An anionic surfactant that serves dual roles as an emulsifier and antimicrobial enhancer in skincare formulations. This ingredient disrupts interfacial tension between oil and water phases while simultaneously boosting the efficacy of preservative systems against acne-causing bacteria.

Summary

Surfactant Emulsifier Penetration enhancer Antimicrobial booster

Science

Mechanism of Action

Functions by reducing surface tension at oil-water interfaces to create stable emulsions, while also modifying stratum corneum lipid organization to enhance penetration of other active ingredients. Additionally exhibits synergistic antimicrobial activity when combined with preservatives, particularly against P. acnes and S. epidermidis.

Research

Clinical Evidence

Medium confidence
Effective range 0.1–5%
Optimal

2.5%

Key findings

  1. 01 Antimicrobial synergy demonstrated at 0.1-5.0% in SymOcide C formulations against acne bacteria
  2. 02 Emulsification stability confirmed at 0.25-4.5% in concentrated cleansing systems

Transparency

Dusting Analysis

Not commonly dusted

Primarily used as a functional ingredient rather than an active, making dusting unlikely

The Formula

Formulation

Solubility
Both
Optimal pH 5 – 9
0 7 14

Stability

Maintains high stability in neutral to alkaline conditions but may precipitate below pH 5.0 due to conversion to acid form

Synergies

  • Preservative systems
  • Oil-soluble actives requiring enhanced penetration

Conflicts

  • Strongly acidic environments (pH < 4.5)
  • Cationic surfactants

Safety

Safety Profile

CIR Status
Safe as used
Max tested
25%
Sensitization risk Moderate

CIR-approved under alkyl ether carboxylic acids category. GHS classification indicates potential for skin and eye irritation in concentrated forms.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Verdict

Optional

A functional ingredient best suited for oily and normal skin types in cleansing formulations where emulsification and antimicrobial enhancement are priorities.

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