The Keratin Filling Leave-In Conditioner is formulated to bond keratin proteins and vitamins to hair follicles, providing both inside and outside of the hair strands with moisture, strength, shine, and manageability. It is a lightweight formula that safeguards against sun damage and maintains frizzy hair, as well as against the negative effects of daily blow-drying and heat styling. It is safe for all hair types, including chemically treated hair, and can be used safely on color-treated hair.