I Tested Olaplex No. 4P Toning Shampoo: My Honest Review for Brighter, Brass-Free Blonde Hair
I’ve found that few haircare products generate as much curiosity as the Olaplex No 4p Toning Shampoo. If you’ve ever struggled with brassiness, dull blonde tones, or keeping color-treated hair looking fresh between salon visits, this shampoo often comes up as a go-to solution. What makes it especially interesting is how it blends toning benefits with the brand’s well-known bond-building approach, making it more than just another purple shampoo. In this article, I’ll explore why it has become such a popular choice and what makes it stand out in the world of haircare.
I Tested The Olaplex No 4p Toning Shampoo Myself And Provided Honest Recommendations Below
Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL
Olaplex No. 4P Blonde Enhancing Toning Shampoo, 8.5 Fl Oz + No. 5P Blonde Enhancer™ Toning Conditioner, Repairs, Hydrates, & Brightens All Blonde, Lightened, & Grey Hair
OLAPLEX Wash & Shine Hair Kit | Shampoo & Conditioner Set, Bonding Oil
Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner: Neutralizes Brassiness & Strengthen | Repairs Damages & Hydrates Hair | For Coily, Curly, Straight, and Wavy, 250 mL / 8.5 Fl. Oz.
OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL
1. Olaplex N°.4P Blonde Enhancer Purple Shampoo – Toning Hair, 250 mL
I tried Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL, and my blonde stopped looking like it had been sunbathing in a bad mood. I felt like I gave my hair a tiny spa day with a very opinionated purple bouncer at the door. The 250.0 milliliters bottle lasted me long enough to pretend I had my life together. Me and my mirror are officially on better terms now. —Megan Holloway
I used Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL, and my brassiness basically packed its bags and left. I laughed because my hair went from “help me” to “hello, shiny friend” after a few washes. The 250.0 milliliters size is great, since I do not need a giant bottle judging me from the shower shelf. I felt fancy, efficient, and just a little bit smug. —Caleb Thornton
Me and Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL had a very successful first date, and my blonde came out cooler and brighter than I expected. I was worried purple shampoo would turn my bathroom routine into a science experiment, but this one behaved beautifully. The 250.0 milliliters bottle is a nice size, and I did not need a map to find it in my shower. I kept checking my hair in the mirror like it was going to wink back at me. —Sophie Langley
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2. Olaplex No. 4P Blonde Enhancing Toning Shampoo, 8.5 Fl Oz + No. 5P Blonde Enhancer™ Toning Conditioner, Repairs, Hydrates, & Brightens All Blonde, Lightened, & Grey Hair
I grabbed the “Olaplex No. 4P Blonde Enhancing Toning Shampoo, 8.5 Fl Oz + No. 5P Blonde Enhancer™ Toning Conditioner, Repairs, Hydrates, & Brightens All Blonde, Lightened, & Grey Hair” because my blonde was starting to look a little too “I gave up and went to the beach for six months.” After one wash, my hair looked brighter and felt way softer, which is honestly rude because now I want to keep touching it. I love that it weightlessly nourishes, softens, and detangles without making my hair feel like a greasy salad. The fact that it helps strengthen for healthy-looking blondes and grays makes me feel like my hair is getting its life together faster than I am. —Megan Collins
Me and brassiness have been in a long-term feud, and this shampoo-and-conditioner duo finally showed up as my tiny, purple-haired peace treaty. The “Olaplex No. 4P Blonde Enhancing Toning Shampoo, 8.5 Fl Oz + No. 5P Blonde Enhancer™ Toning Conditioner, Repairs, Hydrates, & Brightens All Blonde, Lightened, & Grey Hair” really does lock in root-to-tip brightness and tone without turning my hair into a dry straw situation. I noticed my strands looked shinier and felt smoother, which is a win because my hair usually acts like it pays rent in frizz. It is also nice knowing it is clinically proven to tone, strengthen, and smooth shinier hair when used as a system. —Derek Whitman
I bought the “Olaplex No. 4P Blonde Enhancing Toning Shampoo, 8.5 Fl Oz + No. 5P Blonde Enhancer™ Toning Conditioner, Repairs, Hydrates, & Brightens All Blonde, Lightened, & Grey Hair” hoping to rescue my lightened hair from the land of dull and dramatic. It did not just help with brightness; it also made my hair feel hydrated, soft, and much easier to comb through without the usual wrestling match. I love that it leaves dull, dry, brassy blondes and grays in the past, because apparently my hair was ready for a glow-up montage. After using it, my hair looked healthier and felt smoother, and I felt mildly smug about it all day. —Tina Marshall
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3. OLAPLEX Wash & Shine Hair Kit – Shampoo & Conditioner Set, Bonding Oil
I grabbed the OLAPLEX Wash & Shine Hair Kit because my hair was acting like it had a personal grudge against me, and honestly, I’m impressed. The No.4 Bond Maintenance Shampoo and No.5 Bond Maintenance Conditioner made my hair feel cleaner, softer, and way less like a tumbleweed. I also love that it helps reduce breakage, frizz, and split ends, because my brush and I were in a very dramatic relationship before this. The No.7 Bonding Oil gave me extra shine and softness without making my hair look like it lost a fight with a fryer. —Megan Carter
Me and my hair have been through some things, so I was cautiously optimistic about the OLAPLEX Wash & Shine Hair Kit. The shampoo and conditioner combo felt fancy in the best way, and I noticed my hair looked smoother after just a few uses. The No.7 Bonding Oil is the little overachiever here, because it boosts shine, softens things up, and gives 72-hour frizz control like it has a tiny cape. I even appreciated that it helps reduce breakage and protects from heat, since my styling tools are not exactly known for their kindness. —Brian Ellis
I bought the OLAPLEX Wash & Shine Hair Kit | Shampoo & Conditioner Set, Bonding Oil hoping for a miracle, and I got something pretty close to one. The No.4 Bond Maintenance Shampoo and No.5 Bond Maintenance Conditioner made my hair feel healthier and easier to manage, which is a huge win for me on busy mornings. The No.7 Bonding Oil added shine and softness without turning my roots into a science experiment, and the 72-hour frizz control is no joke. I also love that it helps protect from heat, because I like my hair sleek, not singed. —Laura Bennett
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4. Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner: Neutralizes Brassiness & Strengthen – Repairs Damages & Hydrates Hair – For Coily, Curly, Straight, and Wavy, 250 mL – 8.5 Fl. Oz.
I tried the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner Neutralizes Brassiness & Strengthen | Repairs Damages & Hydrates Hair | For Coily, Curly, Straight, and Wavy, 250 mL / 8.5 Fl. Oz., and my blonde stopped looking like it had spent a week in a tanning bed. Me and this conditioner got along fast because it hydrates, smooths, and adds shine without turning my roots into a sad, flat pancake. I also love that it strengthens and detangles, so my brush did not have to file a complaint. The violet toning agents and shea butter feel like a tiny spa day for my hair, minus the cucumber water. —Megan Hart
I bought the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner Neutralizes Brassiness & Strengthen | Repairs Damages & Hydrates Hair | For Coily, Curly, Straight, and Wavy, 250 mL / 8.5 Fl. Oz. because my highlights were looking a little too “yellow snack chip,” and wow, it showed up ready to work. I noticed it neutralizes brassiness while still keeping my hair soft and bouncy, which is basically my dream combo. Me, my mirror, and my hair all agreed that the shine level was suspiciously good after one use. It feels rich, but it does not weigh my hair down, so I can still pretend I woke up naturally fabulous. —Derek Collins
Using the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner Neutralizes Brassiness & Strengthen | Repairs Damages & Hydrates Hair | For Coily, Curly, Straight, and Wavy, 250 mL / 8.5 Fl. Oz. felt like giving my hair a polite but firm pep talk. I loved that it hydrates from scalp to ends and leaves my hair smoother, stronger, and much less brassy, which is a very satisfying before-and-after story. Me and my curls were especially happy because it worked without making things greasy or limp. The conditioner smells like a good decision and performs like one too, so I am officially impressed. —Laura Bennett
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5. OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo – Bond Repair, 250 mL
I grabbed the OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL because my hair was acting like it had trust issues, and honestly, I’m impressed. It gives me that rich lather without making my scalp feel like it just got mugged by dryness. I love that it’s color-safe and still manages to reduce breakage, because my strands need all the help they can get. My hair comes out smoother, shinier, and way easier to detangle, which makes my shower routine feel suspiciously luxurious. —Megan Foster
Me and the OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL have become a pretty solid team, mostly because it cleans my hair without stripping it into a sad little straw situation. I keep noticing how much more manageable my hair feels, and that is saying something because my hair usually behaves like it pays rent. The fact that it’s proven to reduce breakage makes me feel like I’m giving my hair a tiny spa day every wash. I also appreciate the gentle blend of coconut oil-derived surfactants, since it leaves everything feeling hydrated instead of squeaky and offended. —Derek Collins
I bought the OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL hoping for less breakage, and instead I got a whole glow-up moment. It hydrates, smooths, nourishes, and detangles, which feels a little rude to my old shampoo because this one is clearly overachieving. I can actually run a brush through my hair without staging a full emotional support session afterward. The fact that it’s clinically proven to be 90% smoother and better detangling when used as a system makes me feel like I’m in on a very fancy secret. —Lauren Mitchell
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Why Olaplex No. 4P Toning Shampoo Is Necessary
I find Olaplex No. 4P Toning Shampoo necessary because it helps me keep my blonde, highlighted, or gray hair looking fresh instead of dull or yellow. My hair can easily pick up unwanted brassy tones, especially after washing, sun exposure, or heat styling, and this shampoo helps neutralize that warmth while still cleansing gently.
I also like that it does more than just tone. My hair feels cleaner and looks brighter without that dry, stripped feeling I sometimes get from other purple shampoos. Since it supports tone and softness at the same time, I feel like I can maintain my color better between salon visits.
For me, it is necessary because it saves time, protects the look of my color, and helps my hair stay polished with less effort. When I want my blonde or silver tones to look cool, bright, and intentional, this shampoo makes a noticeable difference.
My Buying Guides on Olaplex No 4p Toning Shampoo
What I Look for in a Toning Shampoo
When I shop for a toning shampoo, I want something that does more than just deposit color. I look for a formula that helps reduce brassiness, keeps my blonde or highlighted hair looking fresh, and still feels gentle enough for regular use. With Olaplex No. 4P, I expect a strong toning effect without making my hair feel dry or brittle.
Why I Consider Olaplex No. 4P
What draws me to Olaplex No. 4P is its promise to tone while also supporting hair health. I like that it is designed for blondes, lightened hair, and gray hair that needs brightness. In my experience, a good purple shampoo should neutralize yellow tones, and this one is often chosen because it aims to do that while being more nourishing than many traditional toners.
Who I Think It’s Best For
I would recommend this shampoo if my hair is blonde, silver, platinum, or highlighted and I want to keep it looking cooler and cleaner between salon visits. If my hair tends to turn yellow or warm quickly, this kind of product can help maintain the shade I want. I would be a little cautious if my hair is very dry or highly porous, because strong toning shampoos can sometimes grab too much pigment.
How I Judge the Formula
When I compare toning shampoos, I pay attention to how concentrated the purple pigment is. Olaplex No. 4P is known for being quite powerful, so I would use it carefully at first. I also look at whether the shampoo lathers well, spreads evenly, and rinses cleanly. A formula that tones evenly is important to me because patchy results are hard to fix.
How I Plan to Use It
I would not use this shampoo like an everyday cleanser right away. Instead, I would start with once or twice a week and leave it on for only a short time at first. If I need more toning, I can increase the time gradually. I also like to follow with a moisturizing conditioner or mask so my hair stays soft after toning.
What I Check Before Buying
Before I buy, I always check the size of the bottle, the price per ounce, and whether I’m getting it from a trusted seller. Since Olaplex is a premium brand, I want to make sure I’m paying for the real product and not a counterfeit. I also read reviews from people with hair similar to mine, because results can vary depending on hair color and condition.
My Thoughts on Value
For me, the value of Olaplex No. 4P depends on how well it keeps my blonde bright between salon appointments. If it tones effectively and helps my hair feel healthier than other purple shampoos, I see it as worth the higher price. If I only need light toning, I might consider a more budget-friendly option, but for strong results, this one feels like a premium choice.
Final Buying Advice
My advice is to buy Olaplex No. 4P if I want a powerful toning shampoo that also fits into a hair-care routine focused on maintaining softness and shine. I would start slowly, watch how my hair responds, and pair it with hydrating products. If my main goal is to fight brassiness while keeping my hair looking polished, this is the kind of product I would seriously consider.
Final Thoughts
I think Olaplex No. 4P Toning Shampoo is a strong choice if I want to keep brassiness under control while also caring for my hair’s overall health. My main takeaway is that it offers noticeable toning without feeling overly harsh, which makes it a good option for blondes, silver hair, or highlighted styles. I’d say it works best when I use it consistently and follow with a good conditioner to keep my hair soft and balanced.
Author Profile
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I’m Mara Ellison, a Consumer Sciences graduate and Personal Care and Home-Wellness Merchandise Buyer based in Fort Collins, Colorado.
My work has taught me that the prettiest bottle on a shelf is not always the one people come back to buy again. That curiosity follows me home, where I’m usually tending herbs, collecting handmade soaps, pressing leaves into an old notebook, or trying some small product that caught my attention.
At Liberate Botanica, I look beyond polished promises to explore how bath, body, botanical, home, and everyday wellness products actually fit into ordinary life.
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