Science
Mechanism of Action
As a metallic soap, it forms crystalline or gel-like structures within oil-based formulas, effectively increasing viscosity and preventing droplet coalescence to stabilize emulsions. It also serves as an anticaking and opacifying agent, improving formula consistency and appearance.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 A 2019 CIR assessment found 2.5% Isostearic Acid irritating and comedogenic in a rabbit ear assay, though this is a free fatty acid, not the salt blend.
- 02 Pure Aluminum Stearate, a related salt, demonstrated low acute dermal toxicity in guinea pig studies at 100%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Insoluble in water, this ingredient functions optimally in non-aqueous or oil phases of emulsions, maintaining stability best in neutral to slightly acidic conditions.
Conflicts
- Strong acids
- Strong oxidizing agents
- High water-content systems
Safety
Safety Profile
The CIR assessed it as safe in current uses when formulated to be non-irritating. While up to 21% for individual fatty acids, this blend is typically used at lower concentrations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This ingredient is a valuable formulation aid, effectively improving texture, stability, and aesthetics of oil-based and emulsion products, especially for dry and sensitive skin.
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References
Sources