Science
Mechanism of Action
Operating as an effective emulsifier, PEG-4 Sorbitan Triisostearate reduces the interfacial tension between immiscible phases, thereby creating and stabilizing homogenous formulations. Beyond emulsion stabilization, it functions as a thickener, humectant, and emollient, while also acting as a solvent to potentially improve the skin's absorption of active ingredients.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
This ingredient functions primarily as a formulation aid rather than an active, and its performance does not typically exhibit 'dusting' behavior at higher concentrations beyond its safety limit.
The Formula
Formulation
Stability
Exhibits good compatibility with various surfactants and emulsifiers. Stability is suggested to be broad across a wide pH range, inferred from the characteristics of related PEG sorbitan esters.
Synergies
- Other surfactants
- Emulsifiers
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that PEG Sorbitan/Sorbitol Fatty Acid Esters, including PEG-4 Sorbitan Triisostearate, are safe for use in cosmetics at concentrations not exceeding 25%. It is considered safe when formulated to be nonirritating, with an initial caveat regarding use on damaged skin later removed. Trace amounts of 1,4-dioxane, a byproduct of ethoxylation, may be present but can be controlled through purification steps. The U.S. Food and Drug Administration (FDA) also designates it as safe for general or specific, limited use in food.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-4 Sorbitan Triisostearate is a valuable, versatile formulating agent, enhancing product stability, texture, and potentially ingredient delivery across various skin types, with a strong safety profile up to 25%.
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References
Sources