Review (5/5): Global Keratin is the best brand for keratin treated hair.
Global Keratin is the best brand for hair that is keratin treated. I have heard that as long as shampoo doesn’t have sulfates in it your keratin will last. Not sure this is true, for there seems to be a significant difference in shampoos who say they protect keratin treated hair. Global Keratin is the absolute best. As expensive as keratin treatments are, you want to use the best shampoo. I don’t use anything else now.