Olaplex No.4P Blonde Enhancer Toning Shampoo: Guru Score 77%

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

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✓Yay

"My hair stylist told me to start using this more often. I finally finished it up. I really like this. The scent is nice. Doesn't bother me. It's not over the top."

All 3 takes from No BS Beauty

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"My hair stylist told me to start using this more often. I finally finished it up. I really like this. The scent is nice. Doesn't bother me. It's not over the top."

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"This is their purple shampoo for blonder hair. I don't necessarily know if this really... I think it might help brighten up my blonde a little bit, but it doesn't... my hairdresser said, 'Oh, if you use that, you're really you'll really be platinum blazing.' It doesn't really do that, but it does help brighten it up a bit and kind of fight off some of the other tones in your hair, which can make it look dull."

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"Their purple blonde enhancing shampoo is wonderful. I love it. You don't need to use it every day because if you use it every day your hair, if it's very light, will look purple. But if you use it once a week or so, it really does lighten up your hair and make it look more luminous."

AliceintheRabbitHole

59k subs

✓Yay

"If you have blonde hair and you know it can get a bit brassy, [...] nothing will take the brassiness out as well as Olaplex's purple products. These are products [...] I've had to defend over the years because yes, they will absolutely dye your hands, I use gloves to apply them, and I let it sit on my hair for just 5 minutes or so, but don't leave it on too long or your hair will turn purple. [...] It takes out all trace of brassiness."

Top Pick: purple toning product

Dr. Sam Ellis

898k subs

✓Yay

"Sometimes I feel like if it doesn't get sudsy enough it's really hard to feel like you're getting an even distribution of the product. And the other thing I really like about it is it doesn't leave my hair feeling super dry or stripped and a lot of purple shampoos will do that so that was a big win for me."

Doctor Anne

56k subs

✓Nay

"The Olaplex No4 P Blonde Enhancing Toning Shampoo didn't convince me. It is nice, but I found it quite harsh on my hair and not better than whatever drugstore version I had."

Beyond50Skin

32k subs

✓Yay

"I've used this for over a year and repurchased it. I love it, gives my hair a little bit of a bounce. Usually this kind of gives my hair a little bit of a curl. I did like their purple shampoo."

Alexandra Anele

1.45M subs

✓Yay

"I'm going to pick up another Olaplex purple shampoo. This is hands down the best one. [...] Hands down best purple shampoo in the entire world. [...] You don't need to sit around and wait for it to tone the hair. [...] You just wash it and rinse it out and you're good. It's amazing. I love this purple shampoo. The girl who does my hair color put me on to it years ago and it's what I've been using since I have been platinum this whole time."

What the evidence says.

Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

Frequently asked.

What is Olaplex No.4P Blonde Enhancer Toning Shampoo?

A purple toning shampoo for blonde and lightened hair, designed to neutralize brassy, yellow tones and keep blonde looking bright.

Is Olaplex No.4P Blonde Enhancer Toning Shampoo worth it?

Mostly yes. 5 of the 6 gurus who reviewed it give it their stamp of approval, for a Guru Score of 77%.

What is Olaplex No.4P Blonde Enhancer Toning Shampoo's Guru Score?

Olaplex No.4P Blonde Enhancer Toning Shampoo holds a Guru Score of 77%. That is our read on how warmly the experts talk about it, based on the verdicts of 6 expert reviewers we have collected. At least one expert has named it a Top Pick in its category.