Science
Mechanism of Action
Operating primarily as a surfactant and emulsifier, PEG-4 Stearate facilitates the homogeneous blending and stabilization of oil and water phases in cosmetic products. On the skin, it acts as an emollient, creating a protective barrier to reduce transepidermal water loss and promote a smoother texture. Its humectant properties draw moisture to the skin, and it may also aid in the dermal penetration of other active ingredients.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PEG-4 Stearate effectively stabilizes emulsions, enabling consistent oil-in-water or water-in-oil mixtures. It demonstrates robust stability across a wide pH range, specifically between pH 3.5 and 9.0, and can tolerate the presence of salts and acids. To maintain its integrity, it is advisable to keep formulation temperatures below 80°C.
Conflicts
- Avoid use on compromised or damaged skin due to documented risks of systemic toxicity and contact dermatitis.
Safety
Safety Profile
The CIR Expert Panel has deemed PEG Stearates, including PEG-4 Stearate, safe for use in cosmetics at current concentrations and practices. Clinical evaluations indicate it is neither an irritant nor a sensitizer at concentrations up to 25%. However, caution is advised for use on damaged skin (e.g., burn patients) due to potential systemic toxicity and contact dermatitis. While concerns exist regarding impurities like ethylene oxide and 1,4-dioxane, the cosmetic industry typically implements purification processes to minimize these. The US FDA also recognizes PEG-4 Stearate as safe for specific, limited food applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-4 Stearate is a valuable multi-functional ingredient, widely utilized as a safe emulsifier, surfactant, emollient, and humectant, compatible with all skin types under intact skin conditions.
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