Olaplex no.4c bond maintenance clarifying shampoo is a weekly, deep cleansing shampoo formulated with a broad spectrum clarifying system to remove all classes of damaging impurities without stripping hair. Purified hair looks and feels healthier and receives reparative treatments more effectively for an optimised hair repair routine to repair. Strengthen. Protect. Key benefits removes hair damaging pollutants and heavy metals eliminates minerals, chlorine, and product buildup after just one use deep cleanses for brilliantly clean, soft, shiny hair with vibrant clarity non stripping and non drying deep cleans without stripping leaving hair touchable and soft, never dry or straw like an advanced, broad spectrum clarifying system removes more than just hard water minerals, buildup, and oil. It pulls a wider array of impurities out of the hair including heavy metals, chlorine, and pollutants. Formulated with patented olaplex bond building technology to maintain strong hair bonds as the clarifying system removes damaging impurities. To use apply to wet hair. Concentrate on the scalp and work through to the ends. Lather fully and leave for up to 5 minutes. Rinse well. Use weekly in place of your regular shampoo. Olaplex products are thoroughly tested in house and by independent third party laboratories for safety and efficacy. This product testing includes the industry standard human repeat insult patch test hript, which tests for skin irritation or sensitivity. All olaplex products have passed the hript, meaning the products show no signs of causing irritation, inflammation, or sensitivity.