Pentadoxynol-200 is an ethoxylated pentadecylphenol with approximately 200 ethylene oxide (EO) units. It functions as a nonionic surfactant, emulsifier, and solubilizer in industrial and cosmetic rinse-off products. The long EO chain (200 units) gives it high water solubility and makes it a very mild surfactant. It is primarily used in industrial-strength cleansers and some hair products.
Key Skin Benefits
+ High water solubility — excellent for clear liquid formulations
+ Solubilizing — helps incorporate oils and fragrances in water-based products
+ Mild cleansing — long EO chain reduces irritation potential
+ Wetting agent — improves spreading and penetration of products
Pros
+ Very water-soluble — works in transparent formulations
+ Effective at low concentrations
+ Stable across a wide pH range
Cons
− Ethoxylated alkylphenol — environmental concern (alkylphenol ethoxylates restricted in EU under REACH)
− Potential endocrine disruptor — alkylphenol ethoxylates under scrutiny