Science
Mechanism of Action
This ingredient primarily functions by acting as a nonionic surfactant and emulsifier, significantly lowering the interfacial tension between immiscible oil and water phases to create stable emulsions. It also serves as a solubilizer, facilitating the homogenous dissolution of other components within a formulation. While PEG-80 Castor Oil is generally well-tolerated and contributes a non-greasy feel, related PEGylated castor oils have demonstrated potential for moisturizing, enhancing skin barrier function, promoting stratum corneum repair, and exhibiting anti-inflammatory and anti-pruritic effects.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Castor oil emulsions are optimally stable within a pH range of 5.5 to 7.0; highly acidic environments may lead to physical instability. Polyethylene glycols and their derivatives generally exhibit good microbiological stability, often reducing the need for supplementary preservatives. Overall formulation stability can be influenced by factors such as component ratios, surfactant concentration, ingredient compatibility, and temperature.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed related PEGylated oils, including various PEG Castor Oils, safe for cosmetic use when precisely formulated to be non-irritating. The panel noted potential impurities, specifically ethylene oxide and 1,4-dioxane, as by-products of the ethoxylation process. Stringent purification procedures are therefore critical to remove these trace contaminants before their inclusion in cosmetic formulations. While specific maximum concentrations were established for some related PEGs (e.g., up to 50% for PEG-30 to -40 Castor Oil and up to 100% for hydrogenated variants), a direct maximum concentration for PEG-80 Castor Oil was not provided.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-80 Castor Oil is a valuable formulation aid, primarily functioning as an emulsifier and solubilizer, with good general skin tolerance when purified and used within appropriate pH ranges.
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