Hair Journal · Product Review

Olaplex No. 4 & No. 5: An Honest Stylist Review

If your hair is color-treated, lightened, or just feels fragile, this duo is one of the few at-home products I consistently recommend. But with realistic expectations — it's maintenance that works over time, not an overnight miracle. Here's my honest take.

A quick note: the product links below are affiliate links, so I may earn a small commission if you shop through them — at no extra cost to you. I genuinely use these behind the chair, which is the only reason I'd recommend them.

What they actually are

Olaplex No. 4 is a bond-maintenance shampoo, and No. 5 is the matching conditioner. The "bond maintenance" part is the point: lightening and coloring break down some of the internal bonds that keep hair strong, and this pair is built to help support and maintain those bonds while you cleanse and condition — so hair gradually feels stronger, softer, and more manageable. Quick note on the lineup people mix up: No. 3 is the weekly pre-shampoo treatment; No. 4 and No. 5 are your everyday wash-day pair.

What I genuinely like about it

  • It cleanses without stripping — a big deal for color-treated and blonde hair that fades fast.
  • Used consistently, hair feels stronger and less straw-like, especially after lightening.
  • It's great for fragile, over-processed, and extension hair, where harsh shampoos do real harm.
  • It plays nicely with the rest of a simple routine instead of fighting it.
Olaplex No. 4 & No. 5

The bond-maintenance shampoo and conditioner I reach for with color-treated and lightened hair.

Shop No. 4 →  ·  Shop No. 5 →

Let's be honest about what it won't do

This is where a lot of reviews oversell. It will not undo severe damage overnight, and it won't bring fried, snapping ends back to life — sometimes the kindest thing is a trim. It's also not strictly necessary for someone with very healthy, virgin (un-colored) hair; a good sulfate-free duo may be plenty. Think of it as steady maintenance you'll notice over a few weeks of consistent use, not a one-wash transformation.

How I use it

  • Focus the shampoo on the scalp, where oil builds up.
  • Keep the conditioner on the mid-lengths and ends, where hair is oldest and driest.
  • Wash 2–3 times a week, not daily, to keep color and moisture in (more on that here).
  • Add a weekly mask for extra moisture, and always heat-protect before styling.
Pair it with: Amika Soulfood & The Wizard

Soulfood is my deep-moisture mask for dry or lightened ends; The Wizard is the lightweight heat protectant I use before blow-drying. Together with the Olaplex pair, that's a simple, effective at-home lineup.

Shop Soulfood →  ·  Shop The Wizard →
The verdict

Worth it for color-treated, blonde, lightened, or fragile hair — used consistently, with realistic expectations. If your hair is healthy and uncolored, you can probably skip it. It's a maintenance staple, not a magic wand.

Want my full at-home routine?

Everything I use and recommend — the exact products, how often to use each, and my simple wash-day routine — in one easy guide, with an interactive Wash Day Routine card for your phone.

No spam, ever — check your email to confirm and your free guide is on the way.

Quick answers

Is Olaplex No. 4 & No. 5 worth it?
For color-treated, lightened, or fragile hair, yes — they clean gently while strengthening over time. For healthy virgin hair, a good sulfate-free duo may be all you need.
What's the difference between No. 3, 4, and 5?
No. 3 is the weekly pre-shampoo treatment. No. 4 is the everyday shampoo, No. 5 the matching conditioner — your regular wash-day pair.
Can I use them every day?
You can, but most color-treated hair does best washed 2–3 times a week. Washing less keeps color and moisture in longer.
Does Olaplex really repair damage?
It helps strengthen and maintain bonds over time, so hair feels softer and stronger — but it won't undo severe damage overnight or replace a needed trim.

In the Livonia area? Find me here or book an appointment.