Science
Mechanism of Action
This ingredient functions by significantly lowering the interfacial tension between immiscible liquids, facilitating the creation of uniform and stable emulsions within cosmetic products. As a solubilizer, it enables the homogeneous dispersion of components typically insoluble in a given solvent system. Applied topically, it serves as an emollient, imparting a smooth, soft tactile feel to the skin. It supports skin moisture retention by attracting and locking in atmospheric water, thereby reducing trans-epidermal water loss and bolstering skin barrier integrity. Evidence from related PEGylated castor oils suggests potential anti-inflammatory benefits through the inhibition of inflammatory mediators and reduction of tissue edema.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene glycols and their derivatives generally exhibit robust stability and good skin tolerance. Related PEG-40 Hydrogenated Castor Oil demonstrates an optimal pH range of 5.5-7.0 (at 3% concentration in water), with PEG-60 Hydrogenated Castor Oil exhibiting a neutral pH. It can be efficiently incorporated into the oil phase, even at ambient temperatures (e.g., a suggested 3:1 ratio with oil for related PEG-40 Hydrogenated Castor Oil), prior to combination with the water phase. Melting it into a heated oil phase may facilitate easier blending. Its inclusion significantly enhances product stability by preventing the separation of oil and water components.
Synergies
- Functions effectively with both oil and water phase ingredients to create stable emulsion systems.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed the safety of related PEG Castor Oils and PEG Hydrogenated Castor Oils (e.g., PEG-30, PEG-40 Hydrogenated Castor Oil) for cosmetic use at concentrations up to 100%. This assessment is extrapolated to other members of this ingredient family, including PEG-5 Hydrogenated Castor Oil Triisostearate. The Food and Drug Administration (FDA) recognizes castor oil as a permitted flavoring agent and various PEG Castor Oil ingredients (molecular weight 400-3,000) as indirect food additives, with PEG-30 and -40 hydrogenated castor oil also approved as direct food additives. Trace amounts of 1,4-dioxane, a potential ethoxylation by-product, may be present but are effectively controlled through purification processes. General dermal and ocular irritation studies for PEG Castor Oil and PEG Hydrogenated Castor Oil ingredients typically indicate no adverse reactions.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-5 Hydrogenated Castor Oil Triisostearate is a valuable, multifunctional ingredient for its robust emulsifying, solubilizing, and emollient properties, offering broad compatibility across skin types with a low irritation risk, though its moderate comedogenicity warrants consideration for specific formulations.
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