Isostearoyl Hydrolyzed Keratin

Isostearoyl hydrolyzed keratin is a modified form of keratin — the fibrous protein that makes up hair, skin and nails. The keratin has been broken down (hydrolyzed) into smaller fragments and then chemically bonded to isostearic acid, a fatty acid. This process makes the ingredient more compatible with cosmetic formulations and allows it to penetrate and adhere to skin and hair more effectively.In skincare and haircare products, it functions primarily as a conditioning agent and skin-conditioning agent. It can also act as a mild cleanser or surfactant in some formulations, helping to lift d…

The hydrolyzed keratin fragments are small enough to adhere to the outer layers of skin, where they form a light, conditioning film. This film helps trap moisture and smooth the skin surface, similar to how the ingredient works in haircare products.The isostearoyl (fatty acid) component enhances spreadability and allows the ingredient to integrate into oil and water-based formulations. Together, these components create a conditioning effect that is gentler and more cosmetically elegant than larger, unmodified keratin molecules.

This ingredient is typically found in rinse-off cleansers, conditioners, and leave-on moisturisers. If using a cleanser containing it, apply to damp skin, massage gently, and rinse thoroughly. In conditioners or moisturisers, apply to clean skin and allow it to absorb. It works well in layered routines and can be used daily as part of your regular skincare regimen.

Generally well-tolerated across skin types. Very rarely, individuals with extreme sensitivity to proteins may experience mild irritation, though this is uncommon. Suitable for use alongside other active ingredients.