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Rating: 4Based on 127 reviews
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- Most helpful positiveThe post was made 6 daysRating: 5 out of 5
Saved my hair
First picture taken: November 18, 2025 Last picture taken today, January 12, 2026. Also using shampoo, conditioner, and mask from the same line. Love it!!! - The post was made 1 month
Combine with minoxidil?
Hey! 🌸 This serum really works wonders for the scalp and growth! But I wonder if it's okay to combine it with minoxidil, or if that would be too much?934 views- The user's roll: Customer service at Lyko. The comment was made 1 monthHey Sandra 😊👋 There is a risk that it might be too much. But if you still want to try, I would suggest applying minoxidil first, letting it dry properly, and then using the Kérastase serum. All the best 🤍
- The post was made 2 monthsRating: 5 out of 5
Love this serum
A really good serum that I noticed over time made a big difference. I used it when I was losing a lot of hair, and this serum helped a lot. I found that I wasn't losing as much hair when I brushed, for example. Smells really good and you don't need much when applying! Recommend1817 views - The post was made 3 monthsRating: 5 out of 5verified customer
Miracle serum!
This serum has worked miracles for my thin, worn-out, and damaged hair. I've used a dropper every three days since February, and my hair has grown, become much thicker and stronger. A friend of mine recommended this product, and her hair has, with the help of this serum, the same quality as expensive extensions. This serum is worth every penny, the most important thing is to give the product TIME! I would say that you can already notice a difference after 2-3 months.2224 views - The post was made 3 monthsRating: 3 out of 5verified customer
Kerastase
Feels good on the scalp and smells nice, can't see any major difference regarding hair growth2191 views - The post was made 3 monthsRating: 4 out of 5verified customer
🔥🔥🔥🔥🔥
A very good serum that strengthens the scalp and stimulates hair growth. The hair feels healthier and stronger after regular use. Minus for the slightly high price.1986 views - The post was made 3 monthsRating: 2 out of 5verified customer
No difference
Felt no difference after using 3 bottles1931 views- The user's roll: Customer service at Lyko. The comment was made 3 monthsHi Ma.lida, thank you for taking the time to review! 🤗 So typical that you don't notice any difference after using this. I can highly recommend the hair test to get help with products that might help you better 🥰 lyko.com/sv/beauty-scan/hartestet1 likes
- The post was made 4 months
Usage
Hi I bought this serum and I'm wondering how to use it. I know it says to use it on dry or towel-dried hair, but I'm now wondering can I apply the serum on towel-dried hair and then blow-dry my hair with a hairdryer? Do you get better results when you apply this on damp scalp, so towel-dried? I want my hair to grow fast.2807 views- The user's roll: Hairdresser at Lyko. The comment was made 4 monthsHey Sümeyye! 👋🏼 How fun that you got the Extentioniste serum 🥰 It should be applied directly to the scalp, either on dry or towel-dried hair. You can absolutely use it on damp scalp and then blow-dry your hair – it doesn't negatively affect the effect. The important thing is to massage the serum well into the scalp so that it stimulates and strengthens hair growth 🙌🏼 You get the best results if you use it regularly, preferably after every wash. So there’s really not much difference whether you apply it to dry or towel-dried scalp, many find it feels nicer and easier to distribute on damp scalp 🤗 Have a nice day 🏵️2 likes
- The post was made 5 months
Combine
Can you combine Kevin Murphy Angel Masque with Kérastase Serum Extentioniste?2445 views - The post was made 5 months
Use
Hi, how often should you use this product?3214 views- The user's roll: Former employee. The comment was made 5 monthsHi Helin 🌟 Thanks for the question! Kérastase Resistance Serum Extentioniste is recommended to be used 2-3 times a week, on dry or towel-dried scalp. Apply directly to the scalp section by section, and massage in – it should not be rinsed out. The product strengthens the hair from the root and contributes to healthy length growth over time. Feel free to let me know if you have any more questions 💖1 likes
- The post was made 6 monthsRating: 5 out of 5verified customer
Absolutely perfect
Wonderful2786 views
KérastaseResistanceSerum Extentioniste scalp serum 50 ml
695 kr
Gift
Free delivery option available, can be sent immediately
Description
Ingredients
A strengthening leave-in serum for damaged hair seeking healthier-looking lengths. Leaves hair revitalised and stronger.
Use:
Apply maximum 3 pipettes of Serum Extentioniste along all the scalp, once or twice a week. Using the tips of the fingers, work the Serum into the scalp, using circular motions.
50 ml
- Category:Hair Oil
Gift with purchase
Buy at least 2 from Kérastase
Also available in bundle
Kérastase
Resistance Extentioniste Routine For Weak Hair1 609 kr
Without bundle: 1 790 kr