“Keratin is a protein naturally found in the flat cells of our hairs—it keeps them strong, elastic and healthy. The amount of keratin in our hair diminishes on its own, which leaves the hair feeling brittle and dry. Keratin shampoo works like a domino effect—by using the product consistently, it builds up protein levels on the hair, making it stronger and sleeker. You may not see the results immediately, but after time, you will feel your hair getting softer, and in some cases see less split ends.
I love this shampoo. I've used it for years and it makes my hair sleek and soft. It also leaves my hair smelling amazing!! Hope this helps. :)