Protein Kera Shampoo, is a Keratin infused shampoo that helps to eliminate frizz and makes the hair smooth, silky and shiny. It is both sodium and sulfate free and is the best shampoo to maintain Keratin Treatment, Cysteine Treatment and also works best for color treated hair. Protein Kera Shampoo is an after care product that enhances both the Keratin and Cysteine Treatment leaving the hair, silky, smooth and very shiny