Science
Mechanism of Action
This ingredient operates by leveraging its amphiphilic structure, featuring both lipophilic and hydrophilic segments, to significantly reduce interfacial tension between incompatible substances like oils and water. This allows for the formation of stable emulsions and finely dispersed mixtures. Derived from castor oil, it also carries ricinoleic acid, known for its humectant action—attracting and retaining moisture—and possessing anti-inflammatory attributes.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene glycols generally exhibit a decrease in water solubility and hygroscopicity with increasing molar mass. To maintain optimal stability, formulations should adhere to a pH range of 4.5 to 7.5 and avoid exposure to temperatures exceeding 60°C.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that related PEGylated oils, including PEG castor oils, are safe in cosmetic applications at concentrations up to 50%, provided products are formulated to be non-irritating. Rigorous purification procedures are essential to mitigate the potential presence of trace impurities such as ethylene oxide and 1,4-dioxane. This ingredient is generally considered FDA approved for use, but should not be applied to broken skin. Its use is permitted under the general provisions of the European Union's Cosmetics Regulation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-9 Castor Oil is a valuable, versatile ingredient, serving as an effective emulsifier and solubilizer with inherent humectant properties, contingent upon meticulous purification to ensure safety and optimal performance.
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References
Sources