Science
Mechanism of Action
This ingredient operates by reducing the interfacial tension between otherwise immiscible liquids, leveraging its amphiphilic structure to create stable emulsions. In skin applications, polyethylene glycol (PEG) components are known to retain moisture by forming hydrogen bonds with water molecules and establishing a protective barrier that mitigates transepidermal water loss. Beyond hydration, it imparts a soft and smooth feel to the skin as an emollient and can serve as a vehicle to improve the dermal penetration of co-formulated active compounds.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene glycols generally exhibit robust stability. Related PEG stearates, such as PEG-100 Stearate, demonstrate tolerance to both salt and acid, maintaining functionality across a broad pH range when synergistically paired with glyceryl stearate.
Conflicts
- The terminal hydroxyl groups of PEGs can engage in esterification reactions, which may compromise formulation shelf-life, particularly when combined with active pharmaceutical ingredients possessing carboxylic acid functionality.
- A notable concern is the potential for contamination with toxic impurities, specifically ethylene oxide and 1,4-dioxane, remnants of the ethoxylation process utilized in PEG manufacturing.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that PEG Stearates, including related compounds like PEG-9 Stearate, are safe for use in cosmetic formulations under current practices, a determination re-affirmed in 2005. This safety assessment is contingent upon meticulous formulation to ensure non-irritancy and rigorous control to maintain sufficiently low levels of manufacturing impurities, notably ethylene oxide and 1,4-dioxane. Its application on compromised or damaged skin is not recommended. The U.S. FDA has approved this ingredient for general or specific limited use in food products, and PEGs typically demonstrate low overall toxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its versatile formulation benefits, the absence of specific clinical data regarding skin irritancy and comedogenicity, alongside significant concerns regarding potential manufacturing impurities, indicates insufficient data for a definitive dermatological assessment.
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