What it is: A clarifying shampoo formulated with new technology to reveal your healthiest hair.What it does: Olaplex No. 4C is formulated with a Broad Spectrum Clarifying System and scientifically proven OLAPLEX Bond Building Technology? Optimize your hair repair results by removing more impurities that damage hair. Harsh clarifiers can leave hair like straw. N?4C is sulfate-free & pH balanced to maintain hydrated hair. How to use: Use weekly in place of your regular shampoo. Focus at the root and work through ends. Paraben-free; phthalate-free; sulfate-free; silicone-free; phosphate-free; gluten-free Cruelty-free Vegan Made in the USA