Science
Mechanism of Action
This ingredient functions by significantly lowering the interfacial tension between immiscible liquids like oil and water, thereby creating stable emulsions. Concurrently, it reduces the surface tension of cosmetic products, ensuring their even application and distribution while acting as a robust cleansing agent for the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed PEGylated oils, including PEG-40 castor oil (a close analogue), deeming them safe for cosmetic use up to 50% when formulated to be non-irritating. However, there are significant concerns regarding potential contamination with toxic impurities such as ethylene oxide and 1,4-dioxane, which are common byproducts of ethoxylation. RICINOLETH-40 is restricted in EWG VERIFIED products without adequate substantiation. There is no specific SCCS opinion or direct FDA approval for RICINOLETH-40 as a cosmetic ingredient, although some related PEGylated castor oils are approved as direct and indirect food additives.
Your Skin
Skin Compatibility
Our Assessment
Verdict
RICINOLETH-40 is a valuable emulsifying and cleansing agent, but its use requires careful formulation to avoid irritation and rigorous purity testing to mitigate concerns regarding ethoxylation-related impurities.
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References
Sources
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