Science
Mechanism of Action
On the skin, PEG-40 Hydrogenated Castor Oil acts as an emollient, providing a soft skin feel and creating a hydrating layer to reduce trans-epidermal moisture loss. As a powerful emulsifier, it stabilizes oil and water phases, allowing for homogenous product formulations. It functions as a solubilizer, effectively dispersing lipophilic ingredients like fragrances and essential oils into water-based systems, thereby potentially boosting their performance. Furthermore, its surfactant properties help reduce surface tension, aiding in the gentle cleansing and removal of impurities.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Dermal irritation tests in mice indicated that formulations containing this concentration are unlikely to irritate human skin.
- 02 A microemulsion gel system at this concentration was found not to be a skin irritant in dermal irritancy potential studies in rats.
Transparency
Dusting Analysis
Research data does not indicate that PEG-40 is commonly 'dusted' or associated with 'red flag' percentages for dermal application, primarily focusing on its safety and functional concentrations.
The Formula
Formulation
Stability
This ingredient exhibits good stability in the presence of electrolytes and at low pH. It is non-ionic, maintaining its activity across acid and alkaline conditions. However, it is susceptible to decomposition (hydrolysis) in high pH environments and should be protected from high heat.
Conflicts
- High pH environments (causes decomposition/hydrolysis)
- High heat
Safety
Safety Profile
The CIR Expert Panel deems PEG-40 Hydrogenated Castor Oil safe for cosmetic use at current concentrations and practices, provided formulations are non-irritating. The FDA has also approved it for food additive use. While manufacturing involves ethoxylation, potential 1,4-dioxane contamination is mitigated through purification. Although generally considered non-irritating, some individuals with heightened skin sensitivity or allergies might experience irritation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-40 is a valuable multi-functional ingredient, widely utilized for its emulsifying, solubilizing, and emollient properties, contributing to stable and pleasant skincare formulations with a strong safety profile at typical use concentrations.
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