Why We Picked This Olaplex No. 4P purple shampoo
- Violet pigment in Olaplex No. 4P purple shampoo effectively reduces yellow tones on brassy blonde and gray hair while the patented technology strengthens the hair bond.
- Weightless nourishment softens and detangles without weighing hair down, solving the common dryness that follows bleaching or lightening.
- Clinically measured improvements in smoothness and reduced breakage make this more than a simple toner—it supports long-term hair health.
Key Ingredients & Features
Violet pigment for toning Yellow and brassy tones fade as the formula locks in cooler, brighter color from roots to ends on blonde, highlighted, and gray hair.
Bond-building repair Hair feels stronger and looks healthier after use because the system reduces breakage by 52% and improves smoothness by 89% when shampoo and conditioner are used together.
Weightless hydration Dry, lightened strands gain softness and shine without residue, making detangling easier and the finish more polished.
Unscented formula No added fragrance means it suits those sensitive to scent while still delivering full toning and repair benefits.
Quick Facts
| Attribute | Details |
|---|---|
| Size / Volume | 8.5 Fl Oz shampoo + matching conditioner (17 Fl Oz total) |
| Key Benefit | Tones, repairs, hydrates, brightens |
| Hair Type | Brassy blonde, lightened, gray, color-treated |
| Scent | Unscented |
| Clinical Results | 89% smoother, 52% less breakage after one system use |
| Number of Items | 2 |
Pros & Cons
Pros
- Noticeably cools yellow tones on brassy blonde and gray hair while brightening overall color.
- Delivers measurable strength and smoothness benefits alongside toning.
- Weightless feel keeps hair soft and easy to detangle without buildup.
- Works on a wide range of lightened and gray hair types.
Cons
- Higher price point than many drugstore purple shampoos.
- Best results come from using the full shampoo-and-conditioner system rather than the shampoo alone.
How It Works & What to Expect
Olaplex No. 4P purple shampoo deposits violet pigment that neutralizes yellow tones while the bond-repair technology works inside the hair. Used with the No. 5P conditioner, the system leaves hair feeling softer, looking shinier, and showing less breakage. Texture stays light rather than coated. On brassy blonde or gray hair, expect cooler, more even color and improved manageability after the first full use, with continued brightness and strength when used consistently. Results are progressive for very oxidized brass but clinically supported for smoothness and reduced breakage right away.
Best For / Hair Type & Concern
- Brassy blonde or highlighted hair needing regular toning
- Lightened or bleached hair that feels dry and weak
- Gray or silver hair developing yellow tones
- Color-treated hair seeking brightness plus repair and hydration
- Anyone wanting a strengthening purple shampoo for blonde hair rather than toning alone
Quick Q&A
Is Olaplex No. 4P purple shampoo effective for yellow tones? Yes. The violet pigment targets yellow and brassy tones on blonde, lightened, and gray hair while the system also strengthens and hydrates for brighter, healthier-looking results.
Do I need both Olaplex No. 4P and No. 5P? The clinical claims for 89% smoother hair and 52% less breakage apply when the shampoo and conditioner are used together as a system, so the pair delivers the full benefit.
Can this work on gray hair as well as blonde? It is formulated for all blonde, lightened, and gray hair, helping neutralize yellow tones and restore softness and strength across these categories.
What Shoppers Are Saying
With a 4.6-star average from 244 reviews, users frequently note visible reduction in brass, improved softness, and stronger-feeling hair after using the system. Many highlight the brighter, more polished finish on both blonde and gray hair.
How to Use & Care Tip
Apply Olaplex No. 4P purple shampoo to wet hair, focusing on areas with the most brass, and leave on briefly to allow the pigment to work. Rinse thoroughly, then follow with the No. 5P conditioner from mid-lengths to ends. For ongoing care, use 1–2 times per week depending on how quickly brass returns, and pair with other Olaplex treatments on non-toning days to maintain strength and hydration.
Bring cooler, stronger blonde home—add the Olaplex No. 4P and No. 5P set to your routine today.
