This highly concentrated, sulfate-free shampoo forms a rich lather to neutralize brassiness and boost brightness after one use. Suitable for all blonde, lightened, and gray hair?natural or stylist-created, root-to-tip or balayage?this non-drying formula can be rotated into any hair maintenance routine as needed for your best blonde yet. It?s scientifically proven to boost all blondes three times brighter compared to top purple shampoos. This highly concentrated, sulfate-free shampoo forms a rich lather to neutralize brassiness and boost brightness after one use. No 4P Blonde Enhacer Toning Shampoo by Olaplex for Unisex - 8.5 oz Shampoo