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. Nº.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