Science
Mechanism of Action
This ingredient functions by reducing surface tension, allowing immiscible substances like oil and water to form stable emulsions. As a surfactant, it facilitates the even distribution of products across the skin and effectively lifts impurities. It also acts as a solubilizer, dispersing oily components such as fragrances into water-based systems. With its PEG chains, it imparts emollient properties to soften the skin and can attract moisture as a humectant.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Formulations incorporating PEG-100 Castor Oil typically maintain stable pH levels consistent with normal skin pH over time. Its dual solubility in both water and oil phases makes it highly effective for creating stable oil-in-water emulsions. For optimal blending, it should be integrated into the oil phase before combining with the water phase, with adjustments in concentration potentially improving transparency.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed PEGylated oils, including those chemically related to PEG-100 Castor Oil, safe for cosmetic use at concentrations up to 100% when formulated to be non-irritating. The U.S. FDA also recognizes castor oil as a flavoring agent, and certain PEG Castor Oil derivatives are approved for food use. While generally considered non-irritating and non-sensitizing for intact skin, PEGs should not be applied to broken skin. Trace amounts of 1,4-dioxane, a byproduct of the ethoxylation process, can be effectively managed through stringent purification during manufacturing.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-100 Castor Oil is a valuable multifunctional ingredient, enhancing formulation stability and product performance while offering mild skin conditioning benefits for all skin types.
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