Editor's TipEditor's Tip

Before applying this leave-in serum, wash your hair with Kérastase’s shine-boosting Cristalliste shampoo and conditioner.

Kérastase

Birchbox Breakdown

Ever since we watched the first season of “Gossip Girl,” we’ve been huge fans of Blake Lively’s flowing waves. So we were excited to learn that the blonde actress was the inspiration behind Kérastase’s new serum. Specially designed for long hair, the leave-in treatment adds a high-definition shine while sealing each cuticle (bye bye, split ends). Plus, the light, gorgeously scented formula won’t weigh down your strands.

How to Use

This luxe serum is made with sophisticated light reflectors to add mega-gloss and shine while smoothing away frizz. A generous amount of aloe vera—high in natural amino acids and vitamins—softens and restores dry, brittle ends (the number one problem for girls with long locks).

More for You!
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

755 Reviews
4.1 out of 5 stars
5 Star
311
4 Star
276
3 Star
128
2 Star
29
1 Star
11
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Most Helpful Customer Reviews

LOVE.
SampledPurchased

I use this every day. It's incredible! My hair feels amazing whenever I use it and it is the only product I've ever used that helps moisturize my dry ends. I wish I could bathe in this product.

5
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Hair serum
SampledPurchased

I love this product! I received it in my birchbox and just had to purchase the full size. It smells amazing and adds a lovely shine and smoothness to my ends. It's the perfect product for long fine hair - it detangles, adds shine and softness to my dry ends, is a heat protectant on my long hair and its the best smelling product!

5
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Hand to return
Purchased

This was to heavy for my fine hair. I ended up returning it. It was to bad because I really liked the smell!

2
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Wonders on split ends
Sampled

This product really does work. I used it on my hair and although I don't have bad split ends, it still did a good job at the little amount I had

4
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Amazing
Purchased

This stuff lives up to the hype. Smooths my split ends and makes my hair so shiny. Glad I finally bought it!

5
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Amazinggg!!
Sampled

This stuff is seriously amazing. It makes my hair look so beautifully smooth and smells wonderful. The price point is a bit high for me, but hope to get it with some BB points in the future :)

5
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Not bad!
Sampled

This product does exactly what it says, you just may not see results as soon as you would like. If you have long hair like me, be patient and its worth the wait!

4
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hair product
Sampled

I like this but there was not enough information about this product so I am not entirely sure how to use this product and what it is used for exactly.

2
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Sampled and Bought
SampledPurchased

My hair tends to go flat really fast but also, with all the blow drying I do and now curling, it tends to make my ends go crazy. This product I was first sampled and used after i curled my hair. It provided a shine and didn't weigh it down at all. I love it. I use it only occasionally but was worth buying the big bottle for it. Love the shine I get especially after curling.

5
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Love the product.
Sampled

This product works great. My hair was shiny but not oily or greasy. I also really liked the smell. I've tried other products but my hair is always greasy or oily after. I will definitely be buying this!

4
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