A natural protein derived from silk that helps create a smooth, luxurious texture and adds body to formulas.
CAS #
9007-76-5
Form
Liquid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Bulking
Anti-Inflammatory
Moisturizing
Locks in moisture to keep skin soft and supple throughout the day
Boosts Collagen
Adds volume
Traditional Use
Fibroin is a protein extracted from silk cocoons, used in cosmetics since the mid-20th century. Silk has been valued in Asian skincare for centuries, but the isolated protein ingredient is a modern scientific extraction designed to provide skin-conditioning and film-forming properties.