You’re probably like me, trying to figure out which product is worth the splurge, Olaplex vs Kérastase? Well, same.
I’ve spent years trying to fix my fine, fragile hair that’s prone to breakage, frizz, and flatness. I’ve bleached it, heat-styled it, and overused dry shampoo more times than I want to admit.
So I decided to put the two biggest names in hair repair: Olaplex and Kérastase, to the test.
I committed to trying each for two weeks, using their best-selling repair products on my fine, color-treated hair.
If you’re wondering which one is best for hair damage, softness, volume, or frizz, here’s the ultimate Olaplex vs Kérastase breakdown you need to read before buying.
What I Tested: Olaplex vs Kérastase
Olaplex Products I Used:
- No.3 Hair Perfector – bond-building pre-shampoo treatment
- No.4 Bond Maintenance Shampoo
- No.5 Bond Maintenance Conditioner
- No.7 Bonding Oil – for styling and shine
Kérastase Products I Used (Resistance & Genesis ranges):
- Kérastase Resistance Bain Force Architecte Shampoo
- Kérastase Resistance Ciment Anti-Usure Conditioner
- Kérastase Genesis Défense Thermique Leave-In Spray
- Kérastase Elixir Ultime Oil (on dry hair)
Week 1–2: My Experience Using Olaplex
I used the Olaplex system twice a week and stuck to the full routine. No.3 before shampooing, then 4 and 5 in the shower, with a few drops of No.7 Bonding Oil before heat styling.
What I Loved:
- Hair felt stronger and less prone to snapping
- My ends looked healthier and more sealed
- Over time, there was less visible breakage when brushing
What I Didn’t Love:
- Slight heaviness if I used too much No.5 or No.7
- Took a few washes to see noticeable softness
- Doesn’t give that immediate silky feel post-wash
💬 “Olaplex is like a deep repair treatment in your regular routine, but it takes commitment and consistency to really see the magic.”
Week 3–4: My Experience Using Kérastase
Switching to Kérastase felt luxurious from the first wash. The scent, the texture of the products, even the packaging, everything feels high-end.
What I Loved:
- Hair felt instantly smoother and more manageable
- Gave me more volume and bounce at the roots
- The Elixir Ultime oil made my hair look freshly blow-dried every time
What I Didn’t Love:
- Not as targeted for bond repair
- Pricey, especially when buying a full system
- Slightly heavier on day 2 if you over-apply the oil
💬 “Kérastase made my hair feel so soft and polished right away, but I didn’t feel the same internal repair I got from Olaplex.”
Detailed TikTok Video Comparing Olaplex vs Kérastase Oil
Comparison Table: Olaplex vs Kérastase
| Feature | Olaplex | Kérastase |
|---|---|---|
| Repair Technology | Rebuilds broken disulfide bonds | Surface-level repair + strengthening proteins |
| Best For | Bleached, brittle, or heavily damaged hair | Dry, dull, frizz-prone hair needing softness |
| Scent | Mild, barely noticeable | Strong, luxurious fragrance |
| Styling Result | Strong, manageable, protected | Soft, smooth, frizz-free with bounce |
Pros and Cons: Olaplex vs Kérastase
Olaplex Pros
- Repairs internal hair structure
- Lightweight and buildable
- Great for color-treated or chemically damaged hair
- Includes heat protection (No.7)
Olaplex Cons
- Takes time to see shine or softness
- Can feel heavy if overused
- Less luxurious experience overall
Kérastase Pros
- Instant silkiness and softness
- Luxurious scents and textures
- Adds bounce and shine after just one wash
- Customizable by hair type (Resistance, Nutritive, Genesis, etc.)
Kérastase Cons
- Less internal repair vs. bond builders
- More expensive if building a full routine
- Can weigh down fine hair if not used carefully
FAQs: Olaplex vs Kérastase
Which is better for damaged hair?
Olaplex, hands down. Its patented bond-building molecule works deeper within the hair shaft to rebuild broken bonds from bleach, dye, and heat.
Is Kérastase worth it?
Yes especially if your main concerns are frizz, softness, and luxury styling results. It’s an instant gratification brand.
Can I use Olaplex and Kérastase together?
Yes! Many hairstylists recommend using Olaplex No.3 once a week for repair and Kérastase shampoos/conditioners for softness and shine.
Which one is better for fine hair?
Olaplex is lighter and more reparative. Kérastase can feel richer, so it depends on how much product you apply. I found both worked well on my fine hair if used in moderation.
Final Verdict: Olaplex vs Kérastase – Which One Wins?
Honestly? You can’t go wrong with either but they serve different purposes.
- Choose Olaplex if your hair is chemically damaged, weak, or breaking and you want to rebuild its internal strength.
- Choose Kérastase if your hair feels rough, dry, or frizzy, and you want that smooth, salon-finished look.
💬 “Olaplex is like hair rehab. Kérastase is a luxury vacation.”
Personally, I now use:
- Olaplex No.3 weekly
- Kérastase shampoo + leave-in oil on regular wash days
Related Haircare Reviews You’ll Love:
- Olaplex vs K18: Bond Builders Face-Off
- Ouai vs Olaplex Hair Oil: Which One Wins?
- Best Leave-In Conditioners for Fine, Frizz-Prone Hair
- Kérastase Elixir Ultime vs Olaplex No.7 Oil
Written by Annabelle Williams, Hair & Beauty Editor at Surge of Style
Email: marketing@surgeofstyle.com
This article contains affiliate links. If you purchase through my links, I may earn a commission at no extra cost to you. Prices correct at time of publication.
