Editor's Tip Editor's Tip

For added protection, use together with this shampoo and mask.

Kérastase Résistance Fibre Architecte - Serum for Damaged Hair

$43.00
1 fl. oz. / 30 ml

Availability: In stock

$43.00

Can’t get enough of Kérastase? We feel you. For a limited time, get a free Kérastase Cristalliste Lumiere Liquide - Shine Serum deluxe sample with qualifying $25+ purchase of any full-size product(s) from the Birchbox Shop. Use code: LUMIERE at checkout.

Birchbox Breakdown

Apologies to Gehry, Libeskind, and all the other starchitects: Kerastase is giving you a run for your money—at least when it comes to jawdropping hair feats. The brand’s dual-phase serum transforms damaged hair by repairing its actual foundations—the fibers in each individual strand. Once those are fortified and healthy, the serum adds ceramides for smoothness and gloss. You’ll have a gorgeous, award-worthy coif.

How to Use

Squeeze a dime- to nickel-sized amount (depending on hair length) into palms and rub together. Run hands through damp or dry hair from mid-length to tip. Blow dry or flat iron to seal each cuticle.

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Product Reviews & Sample Feedback

24 Reviews
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Most Helpful Customer Reviews

Keratase

This is fabulous like all of their products.You want shiny,gorgeous hair? This will help get you there. I promise you won't be discouraged and either will your hair.

5
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must have!

This is the best for overprocessed hair. You will notice a huge difference the first time you use it! Worth every penny!

5
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A MUST HAVE for over processed hair; Leaves your hair smooth and perfect!

I swear by this stuff. My outer layers of hair have been bleached and processed, so they are dry as straw- meanwhile the underside of my hair is perfect and smooth. This presents a problem! How do I smooth my outer hair without weighing it down? Taaa daaa! WIth this stuff!
After I wash my hair, I take a dime's worth and rub my hands together, smoothing down my worst hair areas. It works so well that you don't need too much or else your hair will get flat. Afterwards my hair is smooth as silk, as if it had never been processed. Wanna know a secret? There is a L'oreal version of this and its the exact same thing- very hard to find in drugstores but it exists. But when I have the money, this is a must have.

5
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Love the product, but tiny size
Purchased

I love the product, I feel like it gives my long hair the extra tlc it needs, leaving it soft and smooth. I am a Kerastase devotee, and am used to their styling products being the typical 4.2 ounces. I wish I had paid attention to the size when I ordered. This bottle is tiny and its expensive!!!

3
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Great but not enough product!
Purchased

I'm so glad that I used my bonus points to purchase this - I was shocked by how fast it went! This product smells great and seems to have made my hair healthier (I had a nearly fatal illness and my hair started falling out. I didn't start using this until it started growing back and seems to have kept it shiny and thick), but my hair is really short now, so I didn't over use it and it was gone in about a month!

I wish I could give this a higher rating, but the small size was really too much, and makes this product way too expensive.

2
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