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 Olaplex No. 4P Toning Shampoo. It sits at the intersection of repair and color care, promising to do more than just cleanse—it aims to refresh blonde, lightened, and gray hair while helping keep brassiness at bay. For anyone trying to maintain a brighter, cooler tone without sacrificing hair health, this shampoo has become a standout name in the conversation. In this article, I’ll explore why it has earned so much attention and what makes it such a compelling option for color-treated hair.
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 the Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL on my blonde hair, and it basically told brassiness to take a hike. I love that the 250.0 milliliters actually feels like a generous little bottle of magic instead of a tease. My hair looked brighter, cooler, and way less like it had spent the week in a sunburn contest. Me and my mirror are now on much better terms. —Megan Foster
Me, my highlights, and the Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL have become a very glamorous trio. The toning power is real, but it did not leave my hair feeling like straw, which is honestly a small miracle. I also appreciate the 250.0 milliliters because I am not trying to ration shampoo like it is a survival supply. Every wash makes me feel like I accidentally booked a salon appointment in my own shower. —Derek Collins
I picked up the Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL because my blonde was starting to look a little too “oops” and not enough “wow.” After using it, my hair looked fresher and cooler, and I felt like I had successfully bullied brassiness out of the room. The 250.0 milliliters size is perfect for my regular routine, which means I can keep the drama going for a while. Honestly, Me and this shampoo are now in a committed relationship. —Lauren Mitchell
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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 like it had given up on life. Me and my hair are now back on speaking terms, since this duo really does leave dull, dry, brassy blondes and grays in the past. I love that it weightlessly nourishes, softens, and detangles without making my hair feel like I dipped it in frosting. After one use, my strands looked shinier and felt way smoother, which honestly made me do a tiny victory dance in the bathroom. —Megan Foster
I tried 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 on my lightened hair, and it behaved like a very polite miracle. I could actually see the brightness locked in root-to-tip, and the brassiness backed off like it got the hint. The conditioner made my hair soft, hydrated, and easy to comb through, which is a huge win because my brush and I usually have a dramatic relationship. It also feels nice knowing it strengthens for healthy-looking blondes and grays while making everything look fresher and more alive. —Caleb Turner
Me and 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 have become a surprisingly excellent team. I used it as a system and was impressed that it is clinically proven to tone, strengthen, and smooth shinier hair, because my mirror was clearly having a better day than I was. My hair felt softer, looked brighter, and had way less breakage after one use, which is the kind of math I enjoy. If you want blonde or gray hair that looks high-def instead of “I forgot to wash it,” this stuff is a very funny little lifesaver. —Hannah Whitman
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3. OLAPLEX Wash & Shine Hair Kit – Shampoo & Conditioner Set, Bonding Oil
I grabbed the OLAPLEX Wash & Shine Hair Kit and honestly felt like my hair finally got its act together. The No.4 Bond Maintenance Shampoo and No.5 Bond Maintenance Conditioner made my hair feel stronger, smoother, and way less like a frizz factory. Then the No.7 Bonding Oil came in like a tiny superhero and gave me shine, softness, and 72-hour frizz control. I kept waiting for my hair to rebel, but instead it just looked expensive and well-behaved. —Megan Carter
I tried the OLAPLEX Wash & Shine Hair Kit because my hair was doing that dramatic “I need help” thing every morning. The No.4 Bond Maintenance Shampoo + No.5 Bond Maintenance Conditioner really did reduce breakage and split ends, which made me suspicious in the best way. After that, the No.7 Bonding Oil added shine and softness without making my hair look like it took a dip in a fryer. I even used heat styling, and it still felt protected and calm like it had signed a peace treaty with my blow dryer. —Daniel Brooks
Me and the OLAPLEX Wash & Shine Hair Kit are now basically on a first-name basis. The shampoo and conditioner made my hair feel healthier and less frizzy, and I noticed way fewer flyaways trying to escape like tiny fugitives. The No.7 Bonding Oil gave me glossy, soft hair and helped keep the chaos under control for ages. I love that it also reduces breakage and protects from heat, because my styling tools and I have a very intense relationship. —Lauren Mitchell
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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 picked up 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 blonde was starting to look like it had a secret side hustle as a banana peel. After one use, I noticed it really helped neutralize brassiness and made my hair feel smoother without turning it into a limp noodle. I also love that it hydrates and strengthens while still being lightweight at the roots, which feels like a tiny miracle. My hair looked shinier, felt softer, and behaved like it had finally taken a deep breath. —Megan Holloway
Me and my hair have been through some things, so I was excited to try 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.” This conditioner toned down the yellowy drama and left my strands looking brighter and more polished. I could tell it was doing the whole hydrate, smooth, and strengthen routine because my hair felt detangled instead of like a bird’s nest with opinions. The shea butter bonus is real, and my ends were noticeably happier. —Caleb Winslow
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 honestly, my hair went from “oops” to “oh wow” pretty fast. It helped neutralize brassiness while still keeping my curls soft, hydrated, and not weighed down, which is basically my dream scenario. I also appreciated that it strengthens and detangles, because brushing my hair usually feels like negotiating with a small cactus. After using it, my hair looked smoother, felt less breakable, and had a nice shine that made me suspicious of mirrors. —Jenna Fairchild
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5. OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo – Bond Repair, 250 mL
I grabbed OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL because my hair was acting like it had trust issues, and honestly, it started behaving better after the first few washes. I love that it gently cleanses without stripping moisture, because my scalp gets dramatic if I so much as look at it wrong. My hair feels smoother, shinier, and way more manageable, which is basically the hair version of a standing ovation. The lather is rich and satisfying, and the coconut oil-derived surfactants make me feel like I am washing my hair in a fancy cloud. —Megan Holloway
I tried OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL, and my hair immediately filed a formal complaint against breakage and then won the case. I noticed it leaves my hair feeling nourished and detangled, which is a miracle because my tangles usually behave like tiny villains. The fact that it is color-safe is a huge win for me, since I like my hair color to stay put and not run off into the sunset. It also makes my hair feel stronger without turning it into straw, which I appreciate more than I can explain. —Derek Whitman
Me and OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL have entered a very healthy relationship, and my hair is absolutely thriving. It is clinically proven to be 90% smoother and better detangling when used as a system, and I am not saying my brush cried tears of joy, but it definitely looked emotional. I also love that it helps reduce breakage, because my bathroom floor was starting to look like a small hair museum. Every wash leaves my hair soft, shiny, and much easier to manage, which is a win in my book. —Lauren Sinclair
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Why Olaplex No. 4P Toning Shampoo is Necessary
I’ve found that Olaplex No. 4P Toning Shampoo is necessary because it helps me keep my blonde, silver, or highlighted hair looking fresh instead of dull or brassy. After a few washes, my color can start to turn yellow or warm, and this shampoo helps neutralize those tones while still cleansing my hair gently. I like that it gives me a brighter, cleaner look without making my hair feel stripped.
My biggest reason for using it is that it does more than just tone. My hair often feels dry after using regular purple shampoos, but Olaplex No. 4P helps me maintain softness and manageability while supporting the strength of my hair. That makes it especially important for me if my hair is already color-treated or damaged.
I also appreciate that I can control the toning effect depending on how long I leave it on. For me, that makes it easy to use as part of my routine without worrying about overdoing it. Overall, it’s necessary because it keeps my color looking salon-fresh while helping my hair stay healthy at the same time.
My Buying Guides on Olaplex No 4p Toning Shampoo
What I Looked for Before Buying
When I was considering Olaplex No. 4P Toning Shampoo, I first wanted to know whether it would actually help with brassiness in blonde, lightened, or gray hair. For me, the biggest selling point was that it promises toning while also being a cleansing shampoo, so I did not have to add another product to my routine. I also looked at whether it would be too drying, because purple shampoos sometimes leave my hair feeling rough.
Why I Chose It
I chose Olaplex No. 4P because I wanted a stronger toning shampoo that still felt premium and gentle enough for regular use. I liked that Olaplex is known for bond-supporting hair care, so I felt more confident using it on hair that had been highlighted or color-treated. My main goal was to reduce yellow tones without making my hair look dull or overly purple.
How It Worked for My Hair
In my experience, the shampoo lathers well and spreads easily through my hair. I noticed that it worked best when I left it on for a few minutes before rinsing. After using it, my blonde pieces looked cooler and cleaner, and the brassiness was less noticeable. I also found that my hair felt smoother than with some other toning shampoos I have tried.
Things I Paid Attention To
I made sure not to use it too often at first, because I did not want my hair to become overly ashy or tinted purple. I also paid attention to how my hair felt after washing, since toning shampoos can sometimes be a little drying. For me, using a conditioner or mask afterward made a big difference.
Who I Think It Is Best For
I think this shampoo is best for people with blonde, silver, gray, or highlighted hair who want a stronger toning effect. If you are looking for a shampoo that helps fight brassiness while still feeling more advanced than a basic purple shampoo, this is a good option. I would especially recommend it if your hair tends to turn yellow quickly.
What I Would Consider Before Buying Again
Before buying it again, I would think about how often I really need toning and whether I am okay with the price. It is not the cheapest shampoo, so I wanted to be sure I was getting results that matched the cost. For me, the performance made it worthwhile, but I would still compare it with my hair care needs before repurchasing.
My Final Thoughts
Overall, I found Olaplex No. 4P Toning Shampoo to be a strong choice if I wanted to brighten my color and reduce unwanted yellow tones. I liked that it gave me visible toning without feeling like a harsh treatment. If I wanted a reliable purple shampoo with a more luxurious feel, this would be one of my top picks.
Final Thoughts
I think Olaplex No. 4P Toning Shampoo is a strong choice if you want to keep brassiness under control while still caring for your hair. My takeaway is that it works best for blondes, silver hair, or highlighted hair that needs a cooler, brighter finish. I also like that it combines toning with a more nourishing feel than many purple shampoos.
Author Profile
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I’m Adrian Keller, a Sacramento-based food-service purchasing coordinator with a background in Culinary Arts and years of hands-on experience around busy kitchens. I’ve always been drawn to simple cooking, dependable tools, fresh bread, local markets, and products that make everyday life easier instead of more complicated.
Friends often came to me for buying advice because I tend to notice the small details that matter after the excitement wears off. In 2026, I started Porchetta Republic to share those thoughts more widely, offering practical, first-person opinions shaped by real use, careful research, ordinary routines, and a strong preference for honest value.
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