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Rating: 4.5Based on 130 reviews
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- Most helpful positiveThe post was made 8 monthsRating: 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!!!2213 views- The user's roll: Lyko Creator. The comment was made 8 monthsOh wow, what a difference 🫶1 likes
- The post was made 15 hours
Discontinued completely?
Hi hi! I wonder if this fantastic serum that was popular a few years ago has been discontinued completely? So, is production completely stopped? Is the Genesis serum its successor, or how is it? Thank you so much for your help in advance! ✨️💕4 views - The post was made 3 daysRating: 5 out of 5verified customer
Love it!
Have used this for a couple of years, love it, the only product that has helped my hair grow so much!616 views - The post was made 4 months
Is it being discontinued?
Hi! Is this serum being discontinued? It's nowhere to buy, has also been sold out here for quite a while…367 views- The comment was made 2 monthsHi! This product was discontinued, how come it is available again? Have they changed the ingredients?
- The post was made 5 months
How do you use it?
How do you use it?506 views- The user's roll: Customer service at Lyko. The comment was made 5 monthsHejsan Greta!☺️ You use the serum on the scalp 💛 Apply to towel-dried or dry hair and distribute a small amount directly onto the scalp. Gently massage so the product absorbs well 💆♀️ Then leave it in the hair and style as usual! All the best!💛1 likes
- The post was made 6 months
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?734 views- The user's roll: Former employee. The comment was made 6 monthsHey 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💌1 likes
- The post was made 6 months
Mix with others
Can this serum be mixed with elvitals growth booster?852 views- The user's roll: Hairdresser at Lyko. The comment was made 6 monthsHey 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 🤗
- The post was made 6 months
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😊795 views- The user's roll: Customer service at Lyko. The comment was made 6 monthsHello!🤍 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!🙏🏼2 likes
- The post was made 7 monthsRating: 5 out of 5verified customer
Serum
Works so well on dry scalp!1138 views 
Rating: 5 out of 5Wow
Such an insanely good serum for the scalp really. So good really but so expensive unfortunately.1370 views- The post was made 9 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?2080 views- The user's roll: Customer service at Lyko. The comment was made 9 monthsHey 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
KérastaseResistanceSerum Extentioniste scalp serum 50 ml
Sale price 618,80 kr
Without Combo Deal 728 kr
Combo Deal 15%
The price applies when you buy 2 items for a total of 490 kr.
Offer valid through
Product is discontinued
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
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