Science
Mechanism of Action
This ingredient operates by reducing the surface tension between oil and water, enabling the formation of stable emulsions. Its amphiphilic structure, featuring both hydrophilic and hydrophobic regions, allows it to effectively disperse oily components like essential oils and fragrances throughout water-based systems. On the skin, its surfactant properties contribute to cleansing by lifting and removing impurities, and it may also modulate skin barrier properties to facilitate enhanced ingredient absorption.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Typical usage for its functional role as an emulsifier and solubilizer is observed in concentrations between 1% and 5%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysorbate 20 maintains efficacy across a broad pH range (3-9) and demonstrates stability to electrolytes and weak acids/bases. However, it can undergo gradual saponification with strong acids and bases. Oxidative or enzyme-mediated hydrolytic degradation can occur, accelerated by factors such as iron impurities, oxygen, and acidic pH, with potential peroxide formation upon prolonged storage.
Conflicts
- Strong acids
- Strong bases
- May exacerbate fungal acne (malassezia folliculitis)
- May increase skin permeability, potentially enhancing absorption of other substances, including those that might be undesirable.
Safety
Safety Profile
The CIR Expert Panel deems Polysorbate 20 safe for cosmetic use when formulated to be non-irritating. While generally well-tolerated at typical concentrations, excessive doses have shown potential for mild, temporary irritation. Animal studies indicate moderate to strong sensitization under specific, non-representative conditions, and isolated cases of hypersensitivity reactions exist. Concerns regarding 1,4-dioxane contamination are mitigated by proper manufacturing and filtration protocols. The FDA permits its use as a food additive.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polysorbate 20 is a valuable formulation aid, essential for creating stable and aesthetically pleasing products across various cosmetic categories, exhibiting a low risk for irritation and comedogenicity at typical concentrations.
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