Is Olaplex No.4P worth it over the regular No.4?

If you fight yellow or warm tones, yes. No.4P cleanses like No.4 but adds violet toning, so it replaces a separate purple shampoo. If your color is already cool, plain No.4 is the safer pick.

How long should I leave it on?

Start with 1 to 3 minutes and rinse well. Leave it longer for stronger toning, but check every minute or two, since over-toning can leave blonde ashy or faintly lavender.

Can I use it every day?

It is sulfate-free and color-safe, but most people use it two or three times a week and rotate in a regular shampoo. Daily use can dry hair and over-tone it.

Does it work on gray hair?

Yes. Gray and silver hair often picks up warm yellow, and the violet tone neutralizes it. Keep leave-in time short at first, since gray shows over-toning clearly.

One 8.5 fl oz bottle of No.4P Blonde Enhancer Toning Shampoo. No conditioner or other products are included.

The best new price is $24.57 at Loja Glamourosa as of November 4, 2026. Olaplex is often discounted during salon and beauty retailer sales, so watch the price history before buying.