Science
Mechanism of Action
As a key surfactant, sodium stearate effectively lowers surface tension, allowing oil and water to combine and aiding in the removal of dirt and impurities. Its emulsifying capability creates stable, homogenous mixtures vital for creams and lotions. Additionally, it helps regulate product viscosity and contributes to the structural integrity and opacity of solid formulations.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 A 21-day patch test with 0.1-0.25% concentration on 10 subjects showed minimal skin irritation.
- 02 No sensitization was reported in 100 subjects tested with an aqueous solution at 0.3-0.75%.
- 03 A 7% concentration in a stick deodorant formulation demonstrated low potential for human skin irritation and sensitization.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Aqueous solutions exhibit strong alkalinity due to hydrolysis. It is stable under normal storage conditions but may be affected by light exposure.
Conflicts
- strong acids
Safety
Safety Profile
The CIR Expert Panel has concluded that stearate salts, including sodium stearate, are safe for use in cosmetics. It is generally safe within recommended concentrations of 0.5-20%. However, higher concentrations may lead to skin dryness or, if improperly formulated, could potentially clog pores. A patch test is recommended for individuals with sensitive skin, as irritation or allergic reactions are possible. The FDA approves suitable grades for indirect food additive use, and it complies with EU cosmetic regulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium stearate is a valuable multi-functional ingredient, widely utilized and deemed safe by regulatory bodies for its essential roles as an emulsifier, cleansing agent, and texture enhancer within established concentration limits.
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References
Sources