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THIABENDAZOLE.

Questionable CAS 148-79-8 / ANTIMICROBIAL

Thiabendazole is a synthetic benzimidazole derivative primarily recognized for its potent anthelmintic and antifungal properties. In targeted dermatological applications, it functions as a precision agent to address specific parasitic and fungal skin infections.

Antifungal Antiparasitic

Science

Thiabendazole exerts its effect by specifically inhibiting fumarate reductase, a mitochondrial enzyme critical for energy metabolism in susceptible fungi and parasites. This selective disruption impairs their cellular respiration and replication, leading to their therapeutic eradication.


Research

High confidence
Effective range 2–10%
Optimal

N/A

Key findings

  1. 01 Extensive clinical trials affirm its high efficacy against cutaneous larva migrans and various dermatophyte (tinea) infections.

Transparency

Not commonly dusted

Thiabendazole is an active pharmaceutical ingredient (API) with defined therapeutic indications. It is not an ingredient commonly 'dusted' or included at low concentrations for non-specific cosmetic claims, as its primary utility is medicinal and requires specific concentrations for efficacy.


The Formula

Solubility
Oil
Optimal pH 3 – 8
0 7 14

Stability

Thiabendazole demonstrates optimal stability within a moderately acidic to neutral pH range, specifically between pH 3.0 and 8.0. Its practical insolubility in water necessitates its formulation in oil-based vehicles or specific solvent systems for optimal dispersion and delivery.


Safety

CIR Status
Not reviewed for cosmetic use (FDA-approved drug)
Pregnancy
Safe
Sensitization risk Low

As an FDA-approved drug, Thiabendazole is specifically regulated for its therapeutic uses, not for general cosmetic applications. While topical sensitization risk is considered low, its use, especially during pregnancy, requires professional medical consultation due to its pharmaceutical classification.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Questionable

Thiabendazole is a highly effective pharmaceutical agent for its precise indications in treating specific fungal and parasitic skin conditions. However, its inclusion in general precision skincare formulations without a direct therapeutic target is questionable, given its drug status and lack of broad cosmetic benefits.


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