Kerastase Genesis Hair Serum | Daily Strengthening Treatment for Weak or Damaged Hair | Nourishes and Reinforces Hair | Anti-Breakage | Silicone-Free | For Weakened Hair | Serum Fortifiant
Condition: New
Buy Now, Pay Later
As low as
$10.67
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Thursday, Aug 20
Recently Viewed
Size: 3.04 Fl Oz (Pack of 1)
Features
- Fortifiant Hair Serum: A daily strengthening serum designed to prevent hair fall due to breakage from brushing. Enriched with ginger and caffeine treatment improves resistance in weak brittle hair
- Benefit: After use, 97% experience less hair fall due to breakage from brushing. Serum fortifies & strengthens to create nourished & healthy hair. Lightweight formula that will not leave residue
- Additional Benefits: Contains Arginine, an ingredient that helps stimulate healthy hair by supporting strong blood flow to the root of hair cells. Can be targeted to areas with less density
- Suggested Use: Use morning or evening for a minimum of 6 weeks. Apply 4 doses on dry or towel-dried scalp section by section. Massage to promote distribution and absorption into hair. Do not rinse.
- Genesis Collection: Use with Bain Nutri-Fortifiant Shampoo, Fondant Renforcateur Conditioner, and Defense Thermique Primer for nourished healthy-looking hair with reduced breakage. Ideal for normal to dry weakened hair.
Product Dimensions : 1.93 x 1.93 x 6.1 inches; 8.78 ounces
UPC :
Manufacturer : Kerastase
Best Sellers Rank: #1,062 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #22 in Hair Regrowth Treatments
#22 in Hair Regrowth Treatments:
Customer Reviews: 4.5 4.5 out of 5 stars (2,012)
Product Benefits: Reduces hair fall by 97% and strengthens roots with Ginger & Caffeine. Silicone-free, weightless & non-greasy.
Hair Type: All
Scent Name: floral
Item Form: Oil
Liquid Volume: 3 Fluid Ounces
Number of Items: 1
Unit Count: 3.04 Fluid Ounces
Item Volume: 3 Fluid Ounces
Brand Name: KÉRASTASE
Manufacturer: Kerastase
UPC: 884486448149
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Size: 3 Fl Oz (Pack of 1)
I love everything about this product! Pricey but sooooooo worth it!!!! Used as directed and within the first week I started noticing a difference. My hair is softer, way less breakage, hair looks healthier, helped the hair growth. Smells really good too. I wish I would’ve taken before and after pictures.
...
show more
Reviewed in the United States on January 4, 2026 by aalicia31
Size: 3 Fl Oz (Pack of 1)
Excellent product. Since I use it I notice less loss and my hair feels stronger and healthier. It doesn't leave hair greasy and smells very good. It's worth it. 💖
Reviewed in the United States on December 27, 2025 by Riccy mabel argueta
Size: 3 Fl Oz (Pack of 1)
We have only been using this for a few weeks and can already tell a difference in the texture of my hair. There is growth and is fuller to touch. The bottle itself is such larger than I thought and you only need a bit a day. It makes my hair look shiny and healthy for sure. I love the quality of product and can tell that my hair is getting thicker already!
...
show more
Reviewed in the United States on January 22, 2026 by Heart of Sugar Bakery
Size: 3 Fl Oz (Pack of 1)
I’m not usually the type of person who writes reviews for products I order, but I really wanted to share my honest experience. Postpartum completely damaged my hair, and I was desperate to find something that actually worked. I tried Nutrafol and took it consistently for three months, but nothing changed. It felt like a waste of both time and money—and honestly, I hated the taste too. If you’re thinking about trying argan oil, rosemary oil, or any of those “magic” hair growth oils, I’ll say this: if you’re prone to oily roots like I am, you’re probably not going to like them. I hate the feeling of oily roots, so putting oil on my scalp was never something I could stick with. I’m currently on my second bottle of this serum, and when my sister asked me, “What are you doing to your hair?” I went back and looked at my before-and-after photos. I was shocked—I didn’t even realize how much new hair growth I had. My hair looks so much denser, healthier, and thicker, and it smells soooo good. I’m obsessed with the scent, and I’ve been getting so many compliments. I use it almost every day, and one bottle lasts me about a month and a half. It is a bit pricey, but I’m honestly tired of wasting money on random $20–$30 products that don’t work. I will always recommend this product to every girl I know. I comment under posts, reels—anything about hair treatments—and recommend this product to anyone.
...
show more
Reviewed in the United States on December 14, 2025 by Amazon Customer Amazon Customer
Size: 3 Fl Oz (Pack of 1)
love this serum. It makes my hair feel stronger, softer, and reduces breakage within the first few weeks. It’s not greasy and absorbs quickly. The scent is light and pleasant. Perfect if you have weakened or thinning hair. I would definitely buy it again
Reviewed in the United States on December 11, 2025 by Ana Arteaga
Size: 3 Fl Oz (Pack of 1)
WELL YES, but I think there are better and more affordable, each hair is different maybe it works better on your hair so if you can buy it do it, the smell is good, something I like is that it can put it with clean hair and does not leave the hair greasy or anything, it is super soft, IF YOU CAN try it!
...
show more
Reviewed in the United States on September 16, 2025 by Isa Manon
Size: 3 Fl Oz (Pack of 1)
I hate that this works cause it’s so expensive but I’m on my third bottle and it works really well. Hurts to pay for it, but worth it. I use it on my scalp every other day.
Reviewed in the United States on January 30, 2026 by Kat Castellanos
Size: 3 Fl Oz (Pack of 1)
I’ve been using the Kérastase Genesis Hair Serum for a while, and I’m really impressed. My hair feels stronger, smoother, and more manageable, and it looks healthier overall. The serum absorbs quickly, doesn’t leave a greasy residue, and adds a nice shine without weighing my hair down. I’ve also noticed reduced breakage and less frizz, which is a big plus. It’s a bit of an investment, but the results are noticeable and make it worth it if you want to protect your hair from damage while keeping it soft and sleek.
...
show more
Reviewed in the United States on January 3, 2026 by Ms Z Ms Z