Science
Mechanism of Action
This ingredient functions as a dual-action agent, serving as both a surfactant and an emollient. Its surfactant properties facilitate the homogeneous blending of immiscible oil and water phases, essential for stable cosmetic emulsions. As an emollient, PEG-18 Stearate forms a thin, protective fatty layer on the skin's surface, reinforcing the moisture barrier to reduce transepidermal water loss and increase hydration. The hydrophilic polyether segment attracts and retains water molecules through hydrogen bonding, providing sustained moisture, while its 18-carbon stearate chain contributes to its lipophilic properties and skin-conditioning benefits.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Clinical studies demonstrate that PEG Stearates, including PEG-18 Stearate, exhibit no irritant or sensitizing potential at concentrations up to 25%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Generally stable under normal storage conditions, it should be kept away from high temperatures and open flames to maintain its integrity.
Conflicts
- strong acids
- strong bases
- oxidizing agents
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed PEG Stearates, including PEG-18 Stearate, safe for use in cosmetics at concentrations up to 25%. While clinical studies affirm its non-irritating and non-sensitizing nature on intact skin, its use on broken skin is not advised due to observations of sensitization and nephrotoxicity in burn patients treated with PEG-based creams. Manufacturers should ensure proper purification to mitigate potential 1,4-dioxane contamination, a general concern for ethoxylated ingredients like PEGs.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-18 Stearate is a valuable ingredient for formulations requiring emulsification and enhanced skin hydration, offering established safety and broad skin compatibility.
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References
Sources