Kérastase

Genesis Strengthening Scalp and Hair Serum

4.1 · 1052 reviews
7,009 ₽

What it is: A silicone-free, lightweight scalp and hair serum that delivers intensely strengthening care to reduce breakage for weak hair.Hair Texture: Straight, Wavy, and CurlyHair Type: Fine, Medium, and ThickHair Concerns:- Volumizing- Damage/Split Ends/Breakage- ThinningKey Benefits:  - Strengthens Hair Weakened by Heat and Brushing - Hydrates Hair and Adds Shine - Has a Lightweight, Non-Greasy Finish Highlighted Ingredients: Edelweiss Native Cells, Ginger Root, Arginine, and Caffeine. What Else You Need to Know: Breakage is a primary contributor to hair fall, occurring when hair is weakened by daily aggressors, including heat, brushing, and over-styling. Enriched with fortifying ingredients, ginger and caffeine, this non-greasy, silicone-free serum strengthens weakened strands by nourishing and reinforcing hair to address hair fall caused by breakage from brushing.Fragrance Description: The bright, invigorating scent unfolds with top notes of bergamot zest, cedrat, and lime; base notes of basil, bergamot flower, and rose; and base notes of vetiver, musk, and tonka bean.Clinical Results: In a controlled study using a system of Genesis Strengthening Shampoo for Normal to Oily Hair, Genesis Strengthening Conditioner, and Genesis Strengthening Serum for Hair and Scalp vs. a non-conditioning shampoo, results showed:  -98% less breakage -97% less hair fall due to breakage from brushing

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What it is: A silicone-free, lightweight scalp and hair serum that delivers intensely strengthening care to reduce breakage for weak hair.Hair Texture: Straight, Wavy, and CurlyHair Type: Fine, Medium, and ThickHair Concerns:- Volumizing- Damage/Split Ends/Breakage- ThinningKey Benefits:  - Strengthens Hair Weakened by Heat and Brushing - Hydrates Hair and Adds Shine - Has a Lightweight, Non-Greasy Finish Highlighted Ingredients: Edelweiss Native Cells, Ginger Root, Arginine, and Caffeine. What Else You Need to Know: Breakage is a primary contributor to hair fall, occurring when hair is weakened by daily aggressors, including heat, brushing, and over-styling. Enriched with fortifying ingredients, ginger and caffeine, this non-greasy, silicone-free serum strengthens weakened strands by nourishing and reinforcing hair to address hair fall caused by breakage from brushing.Fragrance Description: The bright, invigorating scent unfolds with top notes of bergamot zest, cedrat, and lime; base notes of basil, bergamot flower, and rose; and base notes of vetiver, musk, and tonka bean.Clinical Results: In a controlled study using a system of Genesis Strengthening Shampoo for Normal to Oily Hair, Genesis Strengthening Conditioner, and Genesis Strengthening Serum for Hair and Scalp vs. a non-conditioning shampoo, results showed:  -98% less breakage -97% less hair fall due to breakage from brushing

Customer reviews

2.0
verified purchase

Love Kerastase products, but this one did nothing for me. Went through 1.5 bottles, and used daily per the directions. I was hoping the product would help minimize hair fallout, but it didn’t help after about six weeks of consistent use. If anything, my scalp felt quite itchy and sensitive after application. Wasn’t for me, but may work well for others.

9/30/2026
1.0
verified purchase
EXTREME HAIR LOSSS WORST THAN POSTPARTUM HAIRLOSS😭

I’ve lost half of my hair or MORRRRE!!!!!! I thought maybe this is temporary but it’s been more than two months 😭😭😭😭. And my hair has never looked like this! It’s worse than postpartum hair loss. I had volume in my hair, I just wanted more so volume and to take care of my hair after having two kids back to back. It’s heartbreaking to witness all that hairloss everytime I shower. I’ve never had this type of hair shed! ITS SOOOO EXTREME!!!! I want it to stop!!! I’ve stopped the product. And now I have to wait for my hair to stop shedding 😭😭😭😭

9/30/2026
3.0
verified purchase
Meh on overall moisture to scalp and hair

Really didn't like this, did nothing for me. Ok scent.

9/30/2026
2.0
verified purchase
Not trustworthy

Been using for a couple weeks and already over half way done with the product, for the price I really feel like it should come with more product or bigger size bottle, it barely lasts and I also haven’t noticed a major difference in my hair enough for me to repurchase. My hair is still having a lot of breakage, would not repurchase again unfortunately

9/28/2026
4.0
verified purchase
Excited to get results

i just started using this less than a month ago. It was recommended that I give it a try for my post GLP-1 hair shedding. I've been aggressively using it daily and I can say I love the smell. But slowly seeing small results. Will plan to continue for a few months to get my hair where I really need it to be!

9/14/2026
5.0
verified purchase
I LOVE IT!!!

I used for one month and definitely worked, I love it

9/13/2026
5.0
verified purchase
A Game Changer for Hair Growth & Strength!

Love this serum! It feels lightweight on my scalp and doesn’t leave my hair greasy. My hair feels stronger, healthier, and looks fuller with regular use. I also love how fresh and luxurious it feels. Definitely a product I would repurchase!

9/2/2026
4.0
verified purchase
A MUST TRY ✨

This product feels light-weight & it smells great!

9/1/2026
3.0
verified purchase
Works well for dry scalp

It smells light , the serum is not super thick, it made my scalp feel re freshed and did not make my roots look greasy

8/18/2026
5.0
verified purchase

I honestly so sad it worked because now i have to keep buying it. I’m on my second bottle. Curly hair 3b/3c hair was thinning, lack of density, so i kept it slicked back which caused more thinning. Really reduces hair fall out in the shower

8/14/2026