Science
Mechanism of Action
Primarily bacteriostatic, chlorobutanol exerts its antimicrobial action by disrupting microbial cell membranes, thereby inhibiting growth. It also possesses mild local anesthetic properties upon topical application.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Antimicrobial activity in water is observed from 0.05%.
- 02 Minimum inhibitory concentrations range from 0.065% (Gram-positive bacteria) to 0.5% (fungi).
- 03 However, 0.5% concentration has caused significant corneal damage and irritation in over 50% of subjects in studies.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Chlorobutanol is volatile, subliming readily, and degrades in aqueous solutions, with optimal stability at pH 3. Antimicrobial activity is significantly reduced above pH 5.5, and 0.5% solutions may crystallize at lower temperatures.
Conflicts
- Plastic vials (sorption)
- Rubber stoppers (sorption)
- Bentonite (sorption)
- Magnesium trisilicate (sorption)
- Polyethylene (sorption)
- Polyhydroxyethylmethacrylate (sorption)
- Carboxymethylcellulose (reduced activity)
- Polysorbate 80 (reduced activity)
Safety
Safety Profile
The FDA and UK permit up to 0.5% in cosmetics, but it is generally described as an irritant at this concentration. The EMA notes systemic exposure exceeding 0.5 mg/day for long-term use raises concerns for cardiovascular and reproductive toxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While effective as a broad-spectrum preservative at low concentrations, its significant irritation potential at higher functional levels and complex formulation considerations make it a questionable choice for precision skincare.
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