Olaplex #4P Blonde Enhancer

Highly concentrated purple shampoo cleanses, tones, and repairs while keeping hair hydrated from roots to ends. Sulfate-free formula creates a rich lather to neutralize brassiness and boost brightness after one use for all blonde, lightened, and grey hair.
Scientifically Proven to make blonde 3x Brighter*
*Compared to top purple shampoos
 
HOW TO USE: 1-2 times per week or as often as needed to neutralize unwanted brassiness.