Science
Mechanism of Action
This ingredient operates by significantly reducing the surface tension between otherwise immiscible substances, thereby facilitating the creation and stability of emulsions. It functions as a solubilizer, effectively incorporating oil-soluble compounds into water-based systems. Additionally, it acts as a mild cleansing agent by assisting in the emulsification of oils and dirt, allowing for easier rinsing from the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While precise optimal pH values for Sorbeth-20 Pentaisostearate are not specified, related ethoxylated sorbitan esters like Polysorbate 20 demonstrate stability across a broad pH range of 1.2 to 7.4, with minimal degradation observed between pH 5.5 and 6.2. Therefore, this ingredient is anticipated to maintain stability within typical cosmetic pH ranges, from acidic to slightly alkaline.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that polysorbates, including Sorbeth-20 Pentaisostearate, are safe for use in cosmetics when formulated to be nonirritating. Trace amounts of 1,4-dioxane, a byproduct of the ethoxylation process, may be present but can be controlled through purification. Previous concerns regarding the application of PEGs on compromised skin have been addressed by studies demonstrating minimal dermal penetration, even on damaged skin. This ingredient's class has received FDA approval for specific direct and indirect food additive uses, and its plant-derived components are permissible in EU cosmetic formulations under general regulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sorbeth-20 Pentaisostearate is a valuable functional ingredient for formulation, serving as a safe and effective emulsifier and surfactant suitable for all skin types due to its low irritancy and comedogenicity profile.
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References
Sources