Olaplex No.4P Blonde Enhancer Toning Shampoo is designed for blonde, lightened and grey hair. This concentrated purple shampoo helps neutralise unwanted yellow tones, improving the shine of hair. Its formula, enriched with Bis-Aminopropyl Diglycol Dimaleate, works to repair damaged bonds within the hair, making it stronger and healthier. It is free from sulphates, parabens and phthalates, also suitable for frequent use.