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3.8
Based on 120 reviews
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  • Most helpful positive
    3 months
    verified customer

    Fantastic

    I had very dry and itchy scalp, as well as dry lengths before. I decided to try another hair care, of which this product is one of the new products in my hair routine (I also use Neccin No1 + No3, Sp Wella Luxeoil Keratin Restore Mask, Maria Åkerberg Scalp Treatment Mentha, Kérastase Genesis Thermique leave-in, Olaplex No 9 and Kérastase Elexir Ultimate L’Hulie Originale Hair Oil. Very different series and brands, that is). I use this after washing my hair, and it has really helped to fix my problems. Today my scalp is calm, and the lengths have a lot of moisture, the wear between salon visits is also less than it has been before, I lose less hair, my hair feels stronger, and it grows faster than before. I have nothing negative to say about this product. A super product! ⭐️ #lykosocial #lykoreview #kérastase #serum #lykoreviews

    Translated from swedish

    4 likes
    4481 views
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  • 1 day

    Combine with Genesis serum

    Can this be used together with the Genesis serum?

    Translated from swedish

    90 views
    • Customer service at Lyko
      1 day
      Hey Sally! 😊👋 They are applied to the same area, which can lead to them spreading out over each other, so I wouldn't combine them in the same routine! The scalp can become overstimulated or irritated, and it becomes difficult to determine which one gives results. IF you want to combine them, use Extentioniste in the evening and Genesis in the morning, but pay attention to how your scalp reacts. I would say if you want longer and stronger lengths, then go for Extentioniste, but if you're struggling with increased hair loss, then take Genesis. Good luck with your hair 🥰

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  • 2 days
    verified customer

    Super great product

    Works really well! My hair is getting life and joy again. I apply it to my scalp every evening, and it doesn't get greasy at all. After about 3-4 weeks, my hair is more manageable, and after about 3 months, it has grown like weeds. It also smells divine!

    Translated from swedish

    142 views
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  • verified customer

    So good!!

    Builds up the hair from the roots down

    Translated from swedish

    399 views
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  • This or Genesis?

    Hi! What is the difference between this hair serum and the genesis serum in results? My goal is to get longer and thicker hair, but also stronger if possible, so I heard that one should ideally combine both, but if one had to choose just one, which would give the best results? 😊

    Translated from swedish

    2956 views
    • Customer service at Lyko
      1 month
      Hey Tyra! 🌞 It’s always a bit of a challenge to find the right products in the beauty jungle for you! My best tip is to check out our free hair test, where our experienced hairdressers can recommend products that are tailored just for you and the goals you’re looking for! 🙌😍 You can go directly to the test via the link: lyko.com/sv/beauty-scan2

      1 likes
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  • 1 month

    Bad

    Does nothing for the hair, I put it in the hair roots and massaged it in often. Saw no difference in hair growth, runs out quickly and super expensive! Save your money

    Translated from swedish

    2564 views
    • Customer service at Lyko
      1 month
      Hey Emma! 🥰 It’s a bit different what works for us when it comes to products. Hair and scalp products often take time to show visible results, and sometimes you might need something else if you don’t see any results after a while of use ❤ For the best effect, it’s recommended to combine the serum with the rest of the Extentioniste line, like shampoo and conditioner, but if you still don’t notice any difference, it might be worth trying another product. If you want tips and advice for your specific hair, the hairdressers are always ready to help, and you can find them in the Lyko app under the search function - BeautyScan ✨

      1 likes
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  • 1 month

    Combination

    Can you use it together with the Kerastase Genesis serum? The pink one

    Translated from swedish

    1 likes
    2460 views
    • Customer service at Lyko
      1 month
      Hello there Marre 👋😊 You can use them together, but it's best to alternate between them, for example, use Genesis Serum in the morning and Extentioniste Serum in the evening, or every other day 🙌 If you apply both at the same time, it can be a bit much for the scalp and risk overloading it with active ingredients 🤍 Good luck! 🥰

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  • 2 months

    Contents

    Does this product contain PFAS?

    Translated from swedish

    2379 views
    • Customer service at Lyko
      2 months
      Hey Daniela! ✨ When we looked at the ingredients from the list above, we don't see a hint of PFAS. Hope you like it! ❤

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  • 3 months

    question

    which of this and the genesis serum should I use? I have "vikar" which is a bit thin-haired, so I would like all hair that has been cut off due to extensions to grow out, and that the layered hair should grow and become as long as the rest of the hair, as well as stimulate hair growth in the rest of the hair🤔🩷 I have no other problems with hair loss from the scalp

    Translated from swedish

    1 likes
    5205 views
    • 1 month
      I’m sorry but this product does nothing for hair growth, it only improves the condition of the scalp at best.
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  • 3 months

    protein

    does this contain proteins?

    Translated from swedish

    3207 views
    • Customer service at Lyko
      3 months
      Hey Lisa 🥰👋 The product contains silicones but is free from sulfates and parabens🤍 Take care!

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  • 3 months
    verified customer

    Unrealistic Use

    I only bought one bottle, so I can't judge if the hair growth got any better since the bottle ran out right away. It requires a lot of product to cover the entire scalp, and I still have thinner hair. It feels unrealistic to be able to do any long-term treatment with this product considering the price for the small bottle. If I were to recommend this to anyone, it would be for those with very thin and short hair, spot treatment for balding spots, or for the hairline.

    Translated from swedish

    2830 views
    • Customer service at Lyko
      3 months
      Hey Mariam 🤗 Fortunately, you don't need to use so much product when applying, this is how the product should be used 🙏👇 Apply a maximum of 3 pipettes of Sérum Extentioniste along the key scalp areas, one to two times a week. Use your fingertips to massage the serum into the scalp, in circular motions.

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KérastaseResistanceSerum Extentioniste scalp serum 50 ml

120 reviews, 3.8 on average
483 kr*
Rec. price 695 kr
Free delivery option available, can be sent immediately
* Cannot be combined with discount codes.

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
  • Article number:
    1015-502-0050

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Often bought together

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