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Strengthen, soften and neutralize unwanted yellow tones and brassiness in blonde, lightened and grey hair. Olaplex No.4P Blonde Enhancer Toning Shampoo is gentle enough for everyday use to help brighten and repair your hair. Finish with this highly moisturising professional-standard conditioner which repairs damaged hair, frizz and split ends by re-linking broken bonds, for your healthiest, smoothest hair yet! OLAPLEX products are thoroughly tested in accordance with industry standards in-house and by independent third-party laboratories for safety and efficacy