Science
Mechanism of Action
This ingredient functions by creating stable, homogeneous mixtures of otherwise immiscible oil and water components within a formulation. On the skin, it attracts and binds moisture from the environment, thereby preventing transepidermal water loss and contributing to a smoother, hydrated texture. Furthermore, it aids in dissolving sparingly water-soluble ingredients, acting as a solvent to facilitate their more efficient absorption into the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PEG-8 Sesquioleate is a stable ingredient, demonstrating resistance to moderately strong acids, alkalis, and salt solutions, which contributes to formulation longevity. Its inherent water-binding capacity also helps prevent the cosmetic product itself from drying out. While the PEG-8 portion ensures water solubility, its sesquioleate ester component provides solubility in triglycerides, mineral oils, and fatty esters, classifying it as an effective oil-in-water (O/W) emulsifier.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that PEGs, including their fatty acid esters like PEG-8 Sesquioleate, are safe for use in cosmetics under their current intended conditions. The FDA has also approved PEG-8 for use. A potential concern exists regarding the presence of manufacturing impurities, specifically ethylene oxide and 1,4-dioxane; however, topical application of PEGs is generally considered safe as systemic absorption is not anticipated.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-8 Sesquioleate is a valuable multi-functional ingredient for enhancing formulation stability and improving skin hydration, possessing a generally safe profile as assessed by regulatory bodies, though product purity should be verified.
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