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Moumoujus

TRICLOSAN.

Questionable CAS 3380-34-5 / ANTIMICROBIAL, DEODORANT, PRESERVATIVE

Triclosan is a synthetic broad-spectrum antimicrobial agent historically utilized for its antibacterial and preservative properties. While once prevalent, its use in many consumer products has been significantly curtailed by regulatory bodies due to safety concerns and a lack of demonstrated efficacy, now primarily regulated for specific applications like toothpaste and certain dermally applied cosmetics.

Summary

Antibacterial Preservative Deodorant

Science

Mechanism of Action

At lower concentrations, triclosan functions as a bacteriostatic agent by inhibiting bacterial fatty acid synthesis, specifically binding to the enoyl-acyl carrier protein reductase (ENR) enzyme. This action forms a stable complex, preventing the biosynthesis of fatty acids crucial for bacterial cell membrane formation. At higher concentrations, it acts as a biocide, targeting multiple structures within the bacterial cytoplasm and membrane.

Research

Clinical Evidence

High confidence
Effective range 0.2–2%
Optimal

1%

Key findings

  1. 01 Clinically effective at 1-2% for skin disinfection prior to medical procedures and in wound care.
  2. 02 Demonstrates antibiofilm effectiveness, with studies suggesting 1% concentration.
  3. 03 Recommended at 2% for decolonization of methicillin-resistant Staphylococcus aureus (MRSA) from skin in surgical settings.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
1%
Red flag below
0.5%

While 0.3% is deemed safe as a preservative in certain dermally applied cosmetics, achieving significant active antibacterial benefits, such as antibiofilm action, typically requires concentrations of 1% to 2% in clinical settings. Therefore, cosmetic products claiming active antibacterial efficacy at concentrations below 1% may be considered 'dusting,' relying on its presence rather than demonstrable active effect.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Triclosan exhibits high lipid solubility and is readily soluble in organic solvents like ethanol and methanol, as well as strongly basic solutions. It shows very limited solubility in water (approximately 10 µg/mL).

Conflicts

  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
0.3%
Sensitization risk Unknown

The CIR Expert Panel concluded triclosan was safe as used in 2010. However, the FDA banned its use in consumer antiseptic washes in 2016 due to insufficient evidence of safety and efficacy over plain soap and water. The SCCS in 2022 established maximum safe concentrations as a preservative: 0.3% in dermally applied cosmetic products (excluding body lotions) for adults and children (0.5-18 years), and 0.3% in toothpaste for adults and children (0.5-18 years, but not for children under three in combination). For mouthwash, 0.2% is safe for adults individually but not for children/adolescents. Its use remains regulated in specific products like fluoride toothpaste and other cosmetics.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While a potent broad-spectrum antibacterial agent with proven efficacy in specific clinical applications at higher concentrations, triclosan's widespread use in general consumer skincare has been significantly curtailed by regulatory bodies, limiting its contemporary relevance primarily to a preservative role in a narrow range of cosmetic products.

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