OLAPLEX No. 4P Blonde Enhancer Toning Shampoo is designed to brighten, hydrate, and strengthen blonde and gray hair. With OLAPLEX Bond Building Technology™, this sulfate-free formula neutralizes brassy tones, leaving hair soft and manageable. Ideal for maintaining color, the shampoo can be left on for longer for more intense toning. It’s vegan, color-safe, and perfect for those looking to extend the life of their blonde or gray shades. Regular use leaves hair looking vibrant and rejuvenated.