It completely removed any and all signs of brassiness.

Keep reading for our full product review.

The brand’s buzzy treatments are a hitamongst Byrdie editors, celebrities, and colorists alike.

Olaplex No. 4P Toning Shampoo

@Olaplex/Unsplash

Its acclaim lies in that ittrulylives up to itstransformative claims.

Designed for blonde, lightened, and gray hair, the shampoo intends to neutralize brassiness and boost brightness.

One in three women have blonde hair, says JuE Wong, chief executive officer of Olaplex.

Before and after photos of editor’s hair as part of Olaplex No.4P Blonde Enhancer Toning Shampoo review

Rachel Dube

Ahead, get all the details and read our honest thoughts on Olaplexs newest addition.

4P Toning Shampoo would be a smart addition to your hair arsenal, says curl specialist and coloristChristian Brown.

How to Use

To get the most out of your No.

Before and after photos of editor’s hair as part of Olaplex No.4P Blonde Enhancer Toning Shampoo review

Karli Bendlin

4 Toning Shampoo, the brand recommends using it two to three times a week.

For more intense toning, you’re free to leave it on for up to five minutes.

After you rinse out the shampoo, the brand recommends following it with the Olaplex No.

5 Bond Maintenance Conditioner for best results.

After just one usage, I saw a noticeable difference in the brassiness and dryness.

Safe to say, this purple shampoo has a permanent spot in my arsenal.

Karli Bendlin

I consider myself to be something of an expert when it comes to purple shampoo.

My hair also felt cleaner than it does with other offerings.

Plus, it just felt betterhealthier, softer, and more hydrated.