Science
Mechanism of Action
This compound primarily functions by decreasing the surface tension between immiscible phases, such as oil and water. This allows for the formation and stabilization of emulsions, ensuring product homogeneity. On the skin, its surfactant properties facilitate the emulsification of oils and debris, promoting their efficient removal during cleansing by allowing them to mix readily with water.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Based on information from related polysorbate compounds, this ingredient generally exhibits stability towards electrolytes, weak acids, and weak bases. However, it may gradually undergo saponification when exposed to strong acids or strong bases. Its oleate component can also be susceptible to oxidation under certain conditions.
Safety
Safety Profile
The CIR Expert Panel has determined polysorbates, including closely related PEG-20 Sorbitan Isostearate, to be safe for cosmetic application when formulated to be nonirritating. As an ethoxylated ingredient, trace amounts of 1,4-dioxane, a processing by-product, may be present; however, manufacturers typically employ purification steps to control these levels, a practice monitored by the FDA. Extensive studies on polysorbates have not indicated a cocarcinogenesis risk in cosmetic formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-20 Sorbitan Triisostearate is a valuable multi-functional ingredient, integral for stabilizing formulations and enhancing cleansing efficacy across all skin types, with a strong safety profile.
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References
Sources