Sodium Lauroyl Hydrolyzed Silk

Sodium lauroyl hydrolyzed silk is a surfactant and conditioning agent created by combining hydrolyzed silk protein with lauric acid (a fatty acid derived from coconut oil). The result is a mild, protein-rich ingredient that sits between cleansing agents and conditioning compounds.It functions primarily as a skin and hair conditioning agent, helping to improve texture and softness. As a surfactant, it also contributes mild cleansing action, though it is gentler than many conventional detergents.

The hydrolyzed silk component breaks down silk protein into smaller amino acid chains that can penetrate or coat the outer layer of skin. These amino acids are hygroscopic, meaning they attract and hold water, which helps maintain moisture balance in the stratum corneum.The lauric acid component acts as a surfactant, allowing the ingredient to reduce water tension and improve the spreadability and sensory feel of formulations. Together, these actions create a conditioning effect rather than a deep hydrating one.

This ingredient is typically found in cleansers, conditioners, and leave-on products rather than serums or treatments. It works well in formulations alongside humectants like glycerin or hyaluronic acid to enhance hydration perception. For best results, allow products containing this ingredient to remain on skin for a few moments before rinsing, particularly in rinse-off formulations.

Sodium lauroyl hydrolyzed silk is considered safe for most skin types and is approved for use in cosmetics in the EU and UK. Those with known sensitivities to lauric acid or silk may wish to patch-test first.