Science
Mechanism of Action
Functioning primarily as a surfactant, this ingredient acts as an effective emulsifying agent, stabilizing mixtures of immiscible liquids like oil and water. It also facilitates the solubilization of other ingredients within a formula and contributes to precise viscosity control, ensuring the desired rheology and sensory experience of cosmetic products.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Key findings
- 01 The Cosmetic Ingredient Review (CIR) Expert Panel has extensively assessed PEG-10 Hydrogenated Castor Oil Triisostearate as part of a group of 130 chemically related PEGylated oils, concluding its safety as a cosmetic ingredient in concentrations up to 100% when formulated to be non-irritating. However, specific clinical efficacy data demonstrating direct skin benefits at defined concentrations is not extensively detailed in the provided research.
Transparency
Dusting Analysis
This ingredient primarily serves as a formulation aid (emulsifier, solubilizer, viscosity controller) rather than an active ingredient with a specific 'dusting' threshold for efficacy on the skin.
The Formula
Formulation
Stability
Similar PEGylated castor oil ingredients are non-ionic and exhibit robust stability across both acidic and alkaline conditions, which enhances overall formulation integrity. They also demonstrate resistance to oxidation and chemical degradation, contributing to a longer product shelf life. The optimal pH range for stable formulations, particularly for a 3% solution, is noted to be between 5.5 and 7.0.
Safety
Safety Profile
The CIR Expert Panel has deemed PEG-10 Hydrogenated Castor Oil Triisostearate, along with 129 other related PEGylated oils, safe for use in cosmetics at concentrations up to 100%, provided the final formulation is non-irritating. This assessment supersedes earlier conclusions for some related castor oil derivatives. While minor traces of 1,4-dioxane, a byproduct of the ethoxylation process, may be present, rigorous purification steps can effectively mitigate this concern. The Environmental Working Group (EWG) has raised potential concerns regarding contamination by toxic impurities like ethylene oxide and 1,4-dioxane, advising caution, especially in inhalable product forms, due to potential respiratory irritation. In Europe, its use is permissible under the general provisions of the Cosmetics Regulation. The U.S. FDA acknowledges castor oil on its list of permitted food flavoring agents, and PEG castor oil ingredients may be employed as indirect food additives.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-10 Hydrogenated Castor Oil Triisostearate is a valuable formulation aid, primarily used to stabilize emulsions and control viscosity, with a strong safety profile established by the CIR when incorporated into non-irritating formulations.
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