Science
Mechanism of Action
This ingredient operates as a surfactant, possessing both oil-attracting (lipophilic) and water-attracting (hydrophilic) molecular components. This dual nature allows it to bridge oil and water phases, thereby reducing their interfacial tension and enabling the formation of stable emulsions. It also acts as a wetting and dispersing agent, facilitating the even distribution of insoluble particles, such as pigments or inorganic sunscreens, throughout a liquid base.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
Sorbitan Sesquiisostearate is a functional emulsifier and not an active ingredient with direct skin benefits; therefore, 'dusting' considerations related to efficacy are not applicable.
The Formula
Formulation
Stability
Sorbitan Sesquiisostearate exhibits robust stability across a broad pH range of 2 to 12. However, formulations should avoid excessively high or low pH levels in the presence of water to prevent potential hydrolysis of the ester bond.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Sorbitan Sesquiisostearate, along with other sorbitan esters, safe for use in cosmetic and personal care products. Specific applications report highest concentrations of 3% in foundations, depilatories, and face powders, and 1% in eye shadow and blushers. It is also approved for use under EU Cosmetics Regulation and has FDA recognition in other categories.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sorbitan Sesquiisostearate is a valuable functional ingredient that ensures the stability and homogeneity of diverse skincare and cosmetic emulsions, with a low risk of irritation or comedogenicity.
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