Science
Mechanism of Action
This ingredient operates primarily as a sophisticated skin conditioning agent. Its mechanism involves actively attracting and binding moisture from the ambient environment to the skin's surface, thereby significantly increasing and sustaining hydration levels through its humectant properties. This action leads to enhanced skin elasticity, improved suppleness, and a noticeable reduction in the appearance of fine lines. Furthermore, it forms a lightweight, protective film on the skin, which safeguards against moisture loss and helps defend against environmental aggressors such as pollution. The 'stearoyl' modification imbues it with surfactant properties, allowing it to reduce surface tension within formulations and potentially offer gentle cleansing benefits. Additionally, components of general hydrolyzed silk have demonstrated antioxidant and anti-inflammatory properties, suggesting a broader capacity to protect against free radical damage and soothe irritated skin.
Research
Clinical Evidence
Medium confidence10%
Key findings
- 01 Clinical studies involving silk fibroin, a core component of hydrolyzed silk, demonstrated concentration-dependent moisturizing efficacy. Solutions and cream formulations showed increased substantivity on dry and normal skin, maintaining hydration for over 6 hours. Human irritation and sensitization tests on hydrolyzed silk at concentrations up to 20% aqueous found it to be a non-irritant and non-sensitizer.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While the precise optimal pH range for SODIUM STEAROYL HYDROLYZED SILK is not explicitly defined, other acylated silk proteins like Sodium Lauroyl Hydrolyzed Silk exhibit pH stability between 4.0-7.0. Given the presence of the 'stearoyl' fatty acid chain, this ingredient is highly probable to be oil-soluble, allowing for versatile formulation, including integration into waterless products similar to Isostearoyl Hydrolyzed Silk.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Hydrolyzed Silk, the parent compound, safe for use in cosmetic formulations. While SODIUM STEAROYL HYDROLYZED SILK itself was not specifically reviewed in the provided data, its safety profile is inferred from extensive evidence supporting the non-irritating and non-sensitizing nature of hydrolyzed silk. However, individuals with particularly sensitive skin or known allergies to silk proteins should exercise caution.
Your Skin
Skin Compatibility
Our Assessment
Verdict
SODIUM STEAROYL HYDROLYZED SILK is a valuable multi-functional ingredient, offering significant moisturizing and conditioning benefits, supported by a low sensitization risk and inferred safety profile.
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