Science
Mechanism of Action
As a cationic protein, Laurdimonium Hydroxypropyl Hydrolyzed Silk forms a substantive, moisture-retaining layer on the skin's surface. Its molecular structure, which shares similarities with collagen, actively reduces transdermal water loss and draws hydration into the outermost skin layers. This action promotes a soft, supple feel while supporting skin cell function and potentially stimulating collagen production to minimize the appearance of fine lines. Furthermore, it exhibits anti-inflammatory properties that can soothe irritation and redness, alongside offering protection from environmental stressors due to its rich amino acid and antioxidant composition.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 An aqueous solution of hydrolyzed silk protein (molecular weight = 650 Da) at a concentration of 6.5%, applied daily for 35 days in a cumulative skin irritation study on guinea pigs, demonstrated no abnormalities and was classified as non-irritating to the skin.
- 02 Recommended use levels for hydrolyzed silk protein and peptides in skin and hair care products typically range from 0.5% to 10.0%.
Transparency
Dusting Analysis
Effective concentrations for this ingredient and related hydrolyzed silk proteins begin at 0.5%, with recommendations extending up to 10.0%. This indicates that functional benefits are observed within this range, making it unlikely to be 'dusted' at sub-effective concentrations purely for label claims.
The Formula
Formulation
Stability
Hydrolyzed silk peptides maintain optimal stability within a pH range of 3.5 to 6.5. To preserve ingredient integrity, it is recommended to avoid temperatures exceeding 60°C. Prolonged exposure to heating, particularly above 30-35°C for related derivatives, may lead to degradation.
Safety
Safety Profile
The CIR Expert Panel has evaluated the safety of hydrolyzed silk and other silk protein ingredients, concluding they are safe for use in cosmetics at current concentrations. A 6.5% aqueous solution of hydrolyzed silk protein was deemed non-irritating in skin studies and minimally irritating in ocular studies. While a direct CIR assessment for LAURDIMONIUM HYDROXYPROPYL HYDROLYZED SILK specifically was not found, the safety of its hydrolyzed silk component is well-established.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A versatile and well-tolerated ingredient that significantly enhances skin hydration, elasticity, and barrier function, making it a valuable addition to precision skincare formulations.
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