Science
Mechanism of Action
This compound primarily functions as a preservative by inhibiting the growth of a wide spectrum of microorganisms. As an organic aryl mercury derivative, its lipophilic properties allow it to penetrate and traverse biological membranes, including the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The provided research does not contain information related to 'dusting' claims or thresholds for this ingredient.
The Formula
Formulation
Stability
Phenyl Mercuric Benzoate exhibits sparing solubility in water (estimated at 30.96 mg/L at 25°C) but is also lipophilic. A related compound, phenylmercuric nitrate, demonstrated significant degradation (to mercuric ion and benzene) during heat sterilization (121°C for 15 minutes) in the presence of disodium edetate, particularly at lower pH values (100% degradation at pH 5 and 6, 80% at pH 7, 15% at pH 8). It is generally incompatible with strong oxidizing agents, strong acids, and strong bases.
Conflicts
- strong oxidizing agents
- strong acids
- strong bases
- disodium edetate (under heat sterilization)
Safety
Safety Profile
The Scientific Committee on Consumer Safety (SCCS) of the European Union issued a preliminary opinion in October 2025, concluding that phenylmercuric salts, including benzoate, cannot be considered safe at currently permitted concentrations in cosmetic products due to concerns over renal toxicity, unclear genotoxicity, and cumulative mercury exposure. EU Regulation (EC) No. 1223/2009 generally prohibits mercury compounds in cosmetics, with specific, narrow exceptions for eye products at a maximum of 0.007% (expressed as mercury) only if no other safe and effective preservative is available, requiring a 'Contains Phenylmercuric compounds' warning. Similarly, the U.S. FDA banned mercury in most cosmetics decades ago, with a limited exception for mascara up to 0.0065% (65 ppm) under the condition of no safer alternative. Mercury compounds are readily absorbed through the skin, accumulate in the body, and are associated with allergic reactions, skin irritation, and neurotoxic effects. Australia classifies this ingredient as hazardous with the risk phrase 'Danger of cumulative effects'.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given significant regulatory prohibitions and severe safety warnings from major health authorities regarding its toxicity, bioaccumulation, and high irritancy potential, Phenyl Mercuric Benzoate should be avoided in skincare formulations.
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