Science
Mechanism of Action
Functioning as a nonionic, hydrophilic surfactant, Polysorbate 21 facilitates the stable integration of oil and water components within a formula. It achieves this by lowering the interfacial tension, thereby allowing immiscible liquids to blend. Its unique molecular structure, possessing both lipophilic and hydrophilic segments, enables the effective dispersion of oils in aqueous solutions and improves the overall solubility of other compounds.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysorbate 21 is susceptible to degradation through oxidation and hydrolysis. Hydrolysis can be accelerated by trace enzymes such as lipases, while oxidation may occur due to temperature fluctuations, light exposure, or the presence of trace metal ions. Maintaining an appropriate pH range is crucial for stability, as extreme pH values can influence degradation rates. The inclusion of chelating agents, such as EDTA, can help mitigate metal-catalyzed oxidation, thus preserving product integrity.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Polysorbate 21, along with related polysorbates, safe for cosmetic use, a conclusion reaffirmed in 2015 provided formulations are nonirritating. Extensive clinical testing has indicated a low potential for skin irritation, sensitization, or phototoxicity. European Union regulations permit its use, and the U.S. FDA allows other polysorbates as food additives, reinforcing their general safety profile.
Your Skin
Skin Compatibility
Our Assessment
Verdict
As a fundamental nonionic surfactant, Polysorbate 21 is valuable for ensuring formulation stability and enhancing the solubility of active ingredients across a broad spectrum of skincare applications.
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