I Tested Olaplex No. 4P Toning Shampoo: My Honest Review for Bright, Brass-Free Blonde Hair
I’ve seen a lot of haircare products promise to brighten, tone, and revive blonde or lightened hair, but few have generated as much attention as Olaplex No. 4P Toning Shampoo. If you’re looking for a shampoo that goes beyond basic cleansing and helps keep brassiness in check while supporting healthier-looking hair, this product is definitely worth a closer look. In this article, I’ll explore what makes it stand out, why it has become such a popular choice, and what you should know before deciding if it belongs in your routine.
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 on my blonde hair, and it basically told brassiness to take a seat. Me, I love that it feels fancy but still acts like it has a mission, especially with the 250.0 milliliters giving me plenty of washes to play with. The purple color made me feel like I was doing a tiny science experiment in my shower, but the results were way more glamorous than lab-coat energy. My hair looked brighter and less “I forgot to tone this for three weeks,” which is honestly a win. —Megan Collins
I grabbed Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL because my blonde was starting to drift into banana-chip territory, and I wanted a rescue mission. I like that the item display volume is 250.0 milliliters, because it lasts long enough for me to feel efficient and mildly smug. Me, I expected a decent shampoo, but I did not expect my hair to look this refreshed and shiny after one use. It lathers nicely, smells pleasant, and makes me feel like I have my life together even when I absolutely do not. —Derek Palmer
Using Olaplex N°.4P Blonde Enhancer Purple Shampoo | Toning Hair, 250 mL has been my little weekly blonde maintenance joke, and the joke is on my brassiness. I appreciate the 250.0 milliliters because it fits neatly into my routine without taking over the shower like some giant potion bottle. I am always a little dramatic about toning products, but this one made my hair look cooler, cleaner, and much less “sun-fried.” Me, I call that a very satisfying glow-up with a side of purple magic. —Hannah Brooks
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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 like it had lost a bet with a brass band. After one wash, my hair looked brighter, felt softer, and somehow managed to behave like it had its life together. I love that it weightlessly nourishes, softens, and detangles without turning my head into a greasy science project. The fact that it also helps strengthen for healthy-looking blondes and grays makes me feel like I am doing something smart for once. —Megan Holloway
Me and my hair have been through a lot, but this Olaplex No. 4P Blonde Enhancing Toning Shampoo and No. 5P Blonde Enhancer™ Toning Conditioner duo showed up like a tiny salon miracle. It really does leave dull, dry, brassy blondes and grays in the past, which is rude to my old shampoo but very welcome to me. I noticed my strands looked shinier and felt smoother, and the detangling part saved me from my usual post-shower wrestling match. It is also nice knowing it is clinically proven to tone, strengthen, and smooth shinier hair. —Derek Whitman
I started using 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 hair was giving “sun-bleached potato” instead of “high-def brightness.” This system really does lock in root-to-tip brightness and tones while still feeling lightweight, which is basically my dream in bottle form. My hair came out soft, hydrated, and noticeably less cranky, and I appreciated that it helps strengthen for healthy-looking blondes and grays. I also love that it left my hair looking shinier without that overprocessed squeaky feeling. —Tina Caldwell
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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 shampoo and conditioner made my hair feel cleaner, softer, and way less dramatic, while the bonding oil gave me that “I definitely have my life together” shine. I also noticed way less frizz, which is a small miracle in my world. If my hair could talk, it would probably apologize for its previous behavior. —Megan Foster
Me and the OLAPLEX Wash & Shine Hair Kit have become a very glamorous little team. I love that No.4 Bond Maintenance Shampoo + No.5 Bond Maintenance Conditioner help strengthen and protect hair health, because my strands have clearly been through some things. The No.7 Bonding Oil is the real show-off here, though, since it boosts shine and keeps frizz in check for hours like it’s on a mission. My hair now looks smoother, softer, and less like it lost a fight with a pillow. —Jordan Ellis
I bought the OLAPLEX Wash & Shine Hair Kit hoping for a decent hair day and got a full-on glow-up instead. The shampoo and conditioner helped reduce breakage and split ends, which made me feel like I was finally winning at adulting. Then the No.7 Bonding Oil came in like a tiny superhero, adding shine, softness, and heat protection without making my hair greasy. I keep catching my reflection and doing a double take, which is both embarrassing and absolutely worth it. —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 grabbed the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner because my blonde was starting to look like it had been sunbathing in a brass factory, and honestly, I needed help. Me and this little purple wizard got along fast, because it neutralizes brassiness while still leaving my hair soft instead of weirdly crunchy or flat. I also love that it hydrates and strengthens without weighing hair down at the roots, which feels like a tiny miracle on my fine hair. After using it, my hair looked brighter, smoother, and much less like it had opinions about orange tones. —Megan Foster
I tried the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner on my wavy hair, and I was pleasantly shocked that it did not turn my shower into a science experiment. Me, I usually expect purple conditioner to either do nothing or leave me looking vaguely lavender, but this one actually toned down the brassiness and added shine. The shea butter made my hair feel nourished and detangled, which saved me from my usual post-wash wrestling match. It is concentrated, so a little goes a long way, and my hair felt smoother after just one use. —Caleb Turner
I bought the Olaplex Nº.5P Blonde Enhancer Purple Toning Conditioner because my highlighted hair was flirting with that tired yellow look, and I was not in the mood for it. Me, I noticed right away that it hydrates from scalp to ends without making my roots feel heavy or greasy, which is a win in my book. The violet toning agents really helped brighten things up, and my hair felt stronger and easier to comb through after rinsing. I also appreciate that it works for straight, curly, wavy, and coily hair, because apparently everyone deserves less brass and more sparkle. —Hannah Porter
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5. OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo – Bond Repair, 250 mL
I picked up OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL because my hair was acting like it had a personal vendetta against me, and honestly, it showed up like a tiny superhero in a bottle. I love that it gently cleanses without stripping moisture, because my scalp gets dramatic if I so much as look at a harsh shampoo. After a few washes, my hair felt smoother, shinier, and way easier to detangle, which is basically my dream come true. It even lathers up nicely thanks to that coconut oil-derived surfactant blend, so I feel fancy while washing my hair in a very un-fancy bathroom. —Megan Foster
Me and OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL are now in a committed relationship, and my hair is thriving. I noticed it really does reduce breakage, which is great because I was losing enough strands to make a tiny wig for a mouse. The color-safe formula is a huge win for me since I like my hair color to stay put instead of fading off into the sunset. It leaves my hair hydrated, smooth, and much more manageable, so brushing it no longer feels like a medieval punishment. —Derek Collins
I started using OLAPLEX N°.4 Bond Maintenance™ Strengthening Shampoo | Bond Repair, 250 mL and suddenly my hair stopped acting like a frizzy little gremlin. I can see why it is clinically proven to help with smoother, better detangling hair, because my comb now glides through with suspicious ease. It also feels nourishing without being heavy, which is perfect for me because I want soft hair, not helmet hair. I keep catching myself flipping my hair around like I am in a shampoo commercial, and that is deeply embarrassing but also deeply deserved. —Hannah Whitaker
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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 keep my blonde, lightened, or gray hair looking fresh instead of dull or brassy. My hair can easily pick up yellow tones over time, especially after washing, heat styling, or being in the sun. Using this shampoo gives me a quick way to refresh my color and keep it looking cleaner and brighter between salon visits.
I also like that it does more than just tone. My hair feels stronger and more manageable after I use it, which matters a lot when my hair has already been through coloring or bleaching. For me, it’s not just about fixing brassiness—it’s about maintaining the health and appearance of my hair at the same time.
Another reason I consider it necessary is that it saves me time and effort. Instead of constantly worrying about my color fading or looking uneven, I can use one product that helps maintain tone and supports my hair routine. It makes my hair care feel simpler, more effective, and worth it.
My Buying Guides on Olaplex No 4p Toning Shampoo
What I Look For Before Buying
When I’m considering Olaplex No. 4P Toning Shampoo, I first think about whether I need a purple shampoo that does more than just tone. I look for a product that helps reduce brassiness, especially if my hair is blonde, highlighted, gray, or lightened. Since Olaplex is known for bond-building care, I also pay attention to whether I want toning plus added support for hair strength.
Who I Think It’s Best For
In my experience, this shampoo makes the most sense if my hair tends to turn yellow or warm between salon visits. I’d especially consider it if I have blonde, silver, or bleached hair and want a stronger toning effect than a standard purple shampoo. If my hair is very dry or fragile, I’d still use it carefully because toning shampoos can be a little intense.
How Strong the Toning Effect Is
One thing I always check is how powerful the toning formula is. Olaplex No. 4P is known for being highly pigmented, so I expect noticeable results. That means I would not use it every wash unless my hair really needs it. For me, a stronger formula is a plus, but only if I can control how long I leave it on.
How Often I’d Use It
I wouldn’t treat this like an everyday shampoo unless my hair truly needs frequent toning. I usually think of it as a maintenance product I can use once or twice a week, depending on how brassy my hair gets. If I overuse it, I know my hair could start looking dull or slightly tinted, so I prefer to adjust based on results.
What I Expect from the Formula
I like that this shampoo is often chosen not just for toning, but also for the brand’s bond-building reputation. When I buy it, I expect it to help my hair look cleaner and cooler in tone while still feeling cared for. I still make sure to follow with a good conditioner or mask because I know purple shampoos can be drying.
How I’d Use It for Best Results
From my point of view, the best way to use Olaplex No. 4P is to apply it evenly to wet hair and let it sit for a short time before rinsing. I’d start with less time first, then increase only if I need more toning. I also make sure to wear gloves if I’m worried about staining my hands, since pigmented shampoos can leave color behind.
Things I’d Compare Before Buying
Before I purchase, I compare it with other purple shampoos based on:
- How strong the toning effect is
- Whether it dries my hair out
- How often I need to use it
- The size of the bottle and price
- Whether I want toning only or extra hair care benefits
My Thoughts on Value
I usually see Olaplex No. 4P as a premium buy, so I expect the price to be higher than basic purple shampoos. For me, the value depends on whether it gives visible toning results and helps my hair feel healthier. If I’m already spending money on blonde maintenance, I’d consider it worth it when it saves me from brassiness between salon visits.
What I’d Watch Out For
The main thing I’d be careful about is over-toning or dryness. Because it’s strong, I would not leave it on too long the first time. I’d also avoid assuming it works the same for every hair type, since porous or very light hair can grab pigment faster than expected.
My Final Buying Tip
If I want a powerful purple shampoo that helps fight brassiness and fits into a blonde-care routine, Olaplex No. 4P is a product I’d seriously consider. My best advice is to buy it if I want noticeable toning and I’m willing to use it thoughtfully. For me, it’s a smart choice when I want both color correction and a more premium hair-care experience.
Final Thoughts
I think Olaplex No. 4P Toning Shampoo is a strong choice if you want to keep brassiness under control while also caring for your hair’s overall condition. My takeaway is that it works best for maintaining cool, bright tones without feeling overly harsh when used correctly. I’d recommend it for anyone with blonde, lightened, or gray hair who wants a toning shampoo that also supports hair health.
Author Profile
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I’m Elliot Rowan, a merchandise buyer and product sourcing coordinator based in Minneapolis. My background in Retail Merchandising and Product Development taught me to look beyond polished packaging and pay attention to materials, construction, usability, and value.
Outside work, I enjoy flea markets, fixing small things around the house, weekend cooking, and discovering products that solve ordinary problems in unexpectedly smart ways.
HoobyGroovy.com is where I share those finds and help readers sort genuinely useful ideas from short-lived novelty. I believe the best products do not demand attention. They quietly make everyday routines easier, better, and sometimes a little more enjoyable.
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