What it is
Isostearoyl hydrolyzed keratin is an acylated protein in which isostearic acid is bonded to fragments of hydrolyzed keratin, giving the protein lipophilic character. This makes it substantive to hair and skin, where it forms a conditioning film that improves softness and surface feel. It is commonly used in hair products and multifunctional sprays.
Safety & warnings
Acylated protein derivatives like this are generally well tolerated and valued for their conditioning and substantivity. Hydrolyzed protein ingredients are occasionally a consideration for those with specific protein sensitivities, but reactions at cosmetic use levels are uncommon.
Origin & sourcing
Derived from hydrolyzed keratin (a protein from animal sources such as wool or feathers) modified with isostearic acid, a branched fatty acid.
Questions everyone asks
What is isostearoyl hydrolyzed keratin used for?
It conditions hair and skin by forming a substantive film that improves softness and surface feel.
Is the keratin animal-derived?
Yes, the keratin portion typically comes from animal sources such as wool or feathers.