Science
Mechanism of Action
This ingredient functions by forming micelles, microscopic spheres that encapsulate oil-soluble compounds, enabling their stable dispersion within aqueous solutions. As a surfactant, it reduces surface tension, facilitating the creation and stability of oil-in-water emulsions and the solubilization of lipophilic substances like fragrances or essential oils into water-based systems.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
PEG-25 Castor Oil is a functional excipient rather than a direct active ingredient, thus it is not subject to 'dusting' claims related to skin efficacy.
The Formula
Formulation
Stability
Exhibits excellent stability across a wide pH range (3-9) and is compatible with most cosmetic ingredients due to its non-ionic nature. Its stability can be compromised by strong oxidizing agents or high concentrations of certain electrolytes.
Synergies
- Other non-ionic surfactants for enhanced emulsification
- Humectants to mitigate potential drying effects
Conflicts
- Strong oxidizing agents
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed ethoxylated castor oils, including PEG-25 Castor Oil, concluding them safe for use in cosmetics. The primary concern with ethoxylated ingredients is the potential presence of 1,4-dioxane, a by-product of ethoxylation; however, purification processes minimize this risk. Sensitization is rare at typical cosmetic concentrations, generally below 10% in leave-on products and up to 25% in rinse-off formulations. Pregnancy safety is considered high.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-25 Castor Oil is a valuable functional ingredient for achieving stable formulations by effectively solubilizing lipophilic components and creating robust oil-in-water emulsions.
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