Beauty Olaplex No 4P Guide: Toning Plus Bond Repair - Top Picks Re
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
What Olaplex No 4P is
Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo is a premium purple shampoo that combines violet toning pigments with Olaplex's patented bond building chemistry. It neutralizes brassy yellow tones on blonde, lightened and gray hair while repairing broken disulfide bonds with Bis-Aminopropyl Diglycol Dimaleate. The formula is ultra concentrated, sulfate conscious and designed for all hair textures from coily to straight. It is the purple shampoo for people who want toning without the damage trade off, and it pairs with the No. 5P Toning Conditioner as a complete system. If irritation occurs, stop use and rinse thoroughly. Consistency matters more than using a large amount.
How toning plus repair works
Traditional purple shampoos can be drying because their cleansing base and pigment load stress already fragile blonde hair. No. 4P counters this by delivering bond multiplying molecules in the same wash as the violet pigment. While the pigment cancels yellow optically on the surface, the bond builder works inside the shaft relinking broken disulfide bonds. The result is blonde that gets cooler and stronger simultaneously rather than cooler but drier. The concentration means small doses deliver meaningful amounts of both technologies, which is why the bottle lasts so long despite the premium price. Ask your stylist if you are unsure about compatibility.
How to use No 4P correctly
Wet hair thoroughly, then distribute a small amount of No. 4P between your palms before applying to ensure even coverage. Massage into the hair and scalp, working it through the lengths. Leave for one to three minutes for maintenance, up to five for stronger toning. Rinse thoroughly with cool water. Follow with No. 5P Blonde Enhancer Toning Conditioner for maximum toning and repair, leaving it a few minutes before rinsing. Use weekly or as needed, not daily. Wear gloves if you dislike violet tinted hands, and start with shorter timing on very light or porous hair. Results improve with steady, consistent use over several weeks.
Tips for the best blonde results
Clarify before your first No. 4P use so old product buildup does not block even pigment deposit. Alternate with No. 4 Bond Maintenance Shampoo on non toning washes to keep repair going without over toning. Protect blonde from sun and chlorine, which create the brass you are fighting. Deep condition regularly even though No. 4P is reparative, because blonde needs all the moisture support it can get. Time toning washes a day or two before events so the tone settles naturally. If hair ever looks dull rather than brassy, clarify instead of toning more. Consistency matters more than using a large amount.
Common mistakes to avoid
Over dispensing is the most expensive mistake, since the concentration means a quarter sized amount often suffices. Leaving it on for ten minutes chasing extra toning usually just creates uneven lavender patches. Using it as your everyday shampoo wastes money and over deposits pigment. Skipping conditioner because the shampoo feels reparative misses the toning synergy of the No. 5P pairing. Buying from unreliable sellers risks counterfeit product that can damage hair, so verify the seller. Finally, expecting it to fix orange tones misunderstands color theory, since purple corrects yellow while blue corrects orange. Check the ingredient list if you have known sensitivities.
Recommended Products
These are the products our research team rates highest in this category.
Best for: Blondes who want toning plus Olaplex bond repair together.
Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo, 8.5 oz
- Ultra concentrated purple shampoo with bond building tech
- Neutralizes brassiness and yellow tones
- Reduces breakage and hydrates while toning
- Bis-Aminopropyl Diglycol Dimaleate repairs bonds
Pros
- Tones plus repairs in one step
- Highly concentrated, a little goes far
- Huge review base, proven results
Cons
- Premium price for shampoo
- Can over tone if left on too long
Best for: Devoted No. 4P users buying in economical bulk size.
Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo, 1 Liter
- Full liter of No. 4P purple toning shampoo
- Same concentrated toning and bond repair formula
- Neutralizes brass on blonde, lightened and gray hair
- Use weekly or as needed, 1 to 5 minutes
Pros
- Best value per ounce by far
- Lasts months of weekly use
- Same salon quality formula
Cons
- High upfront cost
- Heavy liter bottle in the shower
Ready to Choose?
See our top product picks for olaplex no 4p, or jump straight to the head-to-head comparison of the two most popular options.