Science
Mechanism of Action
Functioning as an amphiphilic block copolymer of ethylene oxide and propylene oxide, MEROXAPOL 258 acts by significantly reducing the surface tension between disparate components, such as oil and water, facilitating the formation of stable, finely dispersed emulsions. In aqueous solutions, it can self-assemble above a critical micelle concentration, forming micelles that encapsulate and remove lipophilic impurities and soil particles from the skin surface, thereby providing gentle and efficient cleansing.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
MEROXAPOL 258's defined role as a functional ingredient for emulsification and surfactant properties in a wide array of products indicates it is incorporated for its technical utility rather than as a 'dusted' ingredient for unsubstantiated claims.
The Formula
Formulation
Stability
Poloxamer hydrogels, which include Meroxapols, typically exhibit a neutral pH around 7.0-7.2, maintaining stability within this range. However, Meroxapol complexes dissolved in chlorinated organic solvents demonstrate instability upon exposure to oxygen, air, or water. Furthermore, gamma irradiation has been shown to significantly reduce the pH of Poloxamer 407 hydrogels, suggesting compromised stability under such conditions.
Conflicts
- oxygen (in chlorinated organic solvents)
- air (in chlorinated organic solvents)
- water (in chlorinated organic solvents)
- gamma irradiation (for Poloxamer hydrogels)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Poloxamers, a class inclusive of MEROXAPOL 258 (with specific data referencing MEROXAPOL 252), are safe for cosmetic use. Studies indicate minimal ocular irritation and no dermal irritation or sensitization in animal models, with clinical patch tests yielding uniformly negative results. Due to its molecular weight and solubility characteristics, skin penetration is expected to be negligible. The CIR Panel emphasizes that cosmetic manufacturers must employ stringent purification processes to ensure levels of residual 1,4-dioxane, ethylene oxide, and propylene oxide remain below established safety limits. MEROXAPOL 258 is recognized by the FDA and complies with the general provisions of the Cosmetics Regulation in the European Union.
Your Skin
Skin Compatibility
Our Assessment
Verdict
MEROXAPOL 258 is a valuable and versatile ingredient, offering robust emulsification and gentle cleansing properties with a well-established low risk for irritation and sensitization across all skin types.
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References
Sources