Science
Mechanism of Action
This ingredient functions by significantly lowering the interfacial tension between typically immiscible substances like oil and water, thereby forming and stabilizing emulsions. It also acts as a solubilizer, facilitating the dissolution of lipophilic compounds into aqueous formulations. Furthermore, its surfactant properties assist in skin cleansing by enabling oil-based impurities and dirt to mix with water for efficient removal.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Extensive clinical studies on related ingredients, including Polysorbates and PEG Stearates, at concentrations up to 25%, demonstrated minimal potential for human skin irritation, sensitization, or phototoxicity. The CIR Expert Panel identified PEGs as generally non-sensitizing compounds within these groups, concluding safety for cosmetic use with a critical caveat against application on damaged skin.
Transparency
Dusting Analysis
As a functional excipient primarily enhancing formulation stability and ingredient dispersion rather than delivering direct biological activity, PEG-40 Sorbitan Diisostearate is not typically subject to 'dusting' considerations relevant for active ingredients.
The Formula
Formulation
Stability
Aqueous solutions of PEG-40 Sorbitan Diisostearate exhibit optimal stability within a pH range of 6-8. Hydrolysis is deemed unlikely in typical environmental pH conditions of 4-9. PEGs are generally well-tolerated by the skin and do not typically support microbial growth, often reducing the need for strong preservation systems.
Safety
Safety Profile
The CIR Expert Panel has deemed PEG Sorbitan/Sorbitol Fatty Acid Esters, which include PEG-40 Sorbitan Diisostearate, safe for cosmetic applications at concentrations not exceeding 25%. A crucial restriction is to avoid its use on damaged skin. Formulators must ensure that purification steps control any potential trace amounts of 1,4-dioxane, a by-product of ethoxylation. This ingredient holds FDA approval as an excipient and for specific, limited food uses, and is compliant with EU Cosmetics Regulation for plant-derived components.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-40 Sorbitan Diisostearate is a valuable ingredient for improving formulation stability and solubilizing components, demonstrating a low sensitization risk at concentrations up to 25%, provided it is not applied to compromised skin.
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References
Sources