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Rating: 4.2Based on 129 reviews
  • Most helpful positive

    Linda M

    The post was made 2 months
    Rating: 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!!!
    1577 views

    • ulrika

      The comment was made 2 months
      Oh wow, what a difference 🫶
      1 likes

  • Ida

    The post was made 1 week

    Use with Kerastase Genesis Serum?

    Hi, can you use this with Kerastase's genesis serum? How do you recommend using it with this? Do both have the same effect?
    95 views

    • Frida

      The user's roll: Customer service at Lyko. The comment was made 6 days
      Hey Ida 💓 Yes, you can definitely use the Resistance Serum Extentioniste together with the Kérastase Genesis Serum. They complement each other well, even though they have slightly different focus areas. For a simple routine, you can alternate them: use Genesis daily, and Extensioniste a couple of times a week. If you want to use them at the same time, apply one serum to the scalp, massage it in, and let it absorb for a couple of minutes before applying the other. Neither of them should be rinsed out. Have a lovely day ahead💌

  • Moa

    The post was made 2 weeks

    Mix with others

    Can this serum be mixed with elvitals growth booster?
    340 views

    • Sofia

      The user's roll: Hairdresser at Lyko. The comment was made 1 week
      Hey again Moa! 😊 It's no problem to start using the product more closely, as long as you make sure that the scalp is properly clean and that there are no residues of Elvital's Growth Booster left 🥰 Take care of yourself 🤗

  • Moa

    The post was made 2 weeks

    Question

    Hi! I've heard both good and bad reviews about this serum, but I've heard a lot about it potentially causing a lot of hair loss and I'm wondering if that's common and what it's due to. I'm looking for a serum that should help the hair grow better, but I'm afraid they cause hair loss. Best, Moa😊
    345 views

    • Emma

      The user's roll: Customer service at Lyko. The comment was made 2 weeks
      Hello!🤍 Kérastase Resistance Serum Extentioniste is developed to strengthen the scalp and create better conditions for hair growth, not to cause hair loss. There is no evidence that the serum generally leads to hair loss. However, some people with sensitive scalps may experience irritation or discomfort, which in turn can feel like increased hair loss. This is individual and not something that is considered common. If one is concerned, it is recommended to introduce the product cautiously and see how the scalp reacts. In summary, the serum is safe for most, but as with all active products, the experience can vary from person to person!🫧🤍 Take care!🙏🏼
      1 likes

  • Julia

    The post was made 1 month
    Rating: 5 out of 5
    verified customer

    Serum

    Works so well on dry scalp!
    771 views

  • Frida Olsson

    The user's roll: Lyko Creator. The post was made 1 month
    Rating: 5 out of 5

    Wow

    Such an insanely good serum for the scalp really. So good really but so expensive unfortunately.
    1011 views

  • Sandra

    The post was made 3 months

    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?
    1782 views

    • Evelina

      The user's roll: Customer service at Lyko. The comment was made 3 months
      Hey 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 🤍
      1 likes

  • Ebba

    The post was made 4 months
    Rating: 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! Recommend
    2518 views

  • Sofia

    The post was made 5 months
    Rating: 5 out of 5
    verified 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.
    2830 views

  • Fanny

    The post was made 5 months
    Rating: 3 out of 5
    verified customer

    Kerastase

    Feels good on the scalp and smells nice, can't see any major difference regarding hair growth
    2717 views

  • Asenat

    The post was made 5 months
    Rating: 4 out of 5
    verified 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.
    2456 views

KérastaseResistanceSerum Extentioniste scalp serum 50 ml

695 kr
This product is out of stock, and we don't have an exact delivery date. Want an email when it’s back? Click “WATCH” and we’ll make it happen!

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

Also available in bundle

Kérastase
Resistance Extentioniste Routine For Weak Hair
1 609 kr
Without bundle: 1 790 kr

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