Science
Mechanism of Action
This ingredient works by reducing the interfacial tension between immiscible oil and water phases within a cosmetic product. Its amphiphilic nature, possessing both hydrophilic and lipophilic properties, facilitates the formation and stabilization of emulsions. This mechanism allows for uniform blending of ingredients and aids in the effective cleansing and rinsing of oily residues from the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Optimal pH range for Sorbeth-3 Isostearate stability is not specifically documented. However, its primary role as an emulsifier inherently supports the maintenance of emulsion stability across various typical formulation conditions.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed Sorbeth-3 Isostearate, as part of the polysorbate group, safe for cosmetic use provided formulations are nonirritating. While generally considered safe at typical use concentrations, some studies noted minimal irritation. A specific maximum concentration for Sorbeth-3 Isostearate is not available; however, the highest reported maximum use concentration for a related polysorbate (Polysorbate 80) in leave-on products was 11.9%. A structurally similar ingredient, Sorbitan Isostearate, was noted to cause moderate to severe irritation in some animal studies.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sorbeth-3 Isostearate is a valuable functional ingredient for formulating stable emulsions in a wide range of skincare products, deemed safe when used in appropriately nonirritating concentrations.
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References
Sources