Science
Mechanism of Action
As a surfactant, Isosteareth-5 effectively lowers the interfacial tension between disparate liquids, critically facilitating the formation and maintenance of stable emulsions, which is essential for product consistency. Its inherent surfactant properties also allow it to solubilize and aid in the removal of lipid-based impurities and particulate matter from the skin and hair surface during cleansing processes.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While a specific optimal pH range for Isosteareth-5's stability is not precisely defined, it is expected to maintain stability across the typical pH ranges encountered in cosmetic formulations, generally between 2.5 and 10.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Isosteareth-5, as part of the alkyl PEG ethers group, is safe for use under current practices and concentrations, provided the final formulation is non-irritating. A specific maximum concentration for Isosteareth-5 itself has not been established, but a related ingredient, Isosteareth-2, was deemed safe at ≤1% in leave-on products and ≤2% in rinse-off products. There is no available opinion from the SCCS, but it is recognized by the FDA Global Substance Registration System (GSRS).
Your Skin
Skin Compatibility
Our Assessment
Verdict
Isosteareth-5 is a valuable foundational ingredient for formulators, providing essential emulsifying and cleansing properties to stabilize diverse cosmetic products safely and effectively.
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References
Sources