Price: $33.00
(as of Mar 03, 2026 19:33:18 UTC – Details)
Product description
Fortify Hair Prone To Falling
Genesis
Our hair care collection that treats hair fall due to hair breakage from brushing. The Genesis collection is a dual action fortifying system professionally formulated to strengthen hair and reduce hair breakage.
Expert Formulas
Powered by Edelweiss Native Cells and Ginger Root
Edelweiss Native Cells & Ginger Root: Detangle, moisturize, and increase strength and softness. 
Fusio-Dose
Professional In-Salon Treatment
Instant Transformation, Infinite Possibilities.
In-Salon Service
Your appointment
Make an appointment in your Kérastase salon for a personalized hair diagnosis.
1 Ingredients
2 Fusio-Dose
3 Diagnosis
Discover Genesis
Nutri-Fortifiant Shampoo
Gently Cleanses Scalp and HairIntensely Moisturizes and Easily DetanglesStrengthens Hair Weakened by Heat Damage and Brushing
Hydra-Fortifiant Shampoo
Gently Cleanses Scalp and Hair to Remove Excess BuildupStrengthens Hair Weakened by Heat Damage and BrushingNourishes and Easily Detangles Hair
Renforcateur Conditioner
Intensely Moisturizes and Adds BodyStrengthens Hair Weakened by Heat Damage and BrushingEasily Detangles and Prevents Split Ends
Reconstituant Hair Mask
Intensely Nourishes and Hydrates HairStrengthens Hair Weakened by Heat Damage and BrushingSmooths and Easily Detangles
Defense Thermique Hair Serum
Protects Against Heat StylingDelivers Up to 24 Hours of Frizz ProtectionStrengthens Hair Weakened from Brushing and Over-Styling
Fortifiant Hair Serum
Strengthens Hair Weakened by Heat and BrushingHydrates Hair and Adds ShineHas a Lightweight, Non-Greasy Finish
What is the fragrance in Serum Fortifiant Hair Serum?
Inspired by the energy flowing from modern colognes, Genesis fragrance is a bright, invigorating scent of bergamot & a hint of aromatic green.
How often should I use Serum Fortifiant Hair Serum?
For best results to strengthen weakened hair, we recommend using Serum Fortifiant Hair Serum daily after using a shampoo and conditioner or hair mask.
Should I use Serum Fortifiant Hair Serum on wet or dry hair?
We recommend using Serum Fortifiant Hair Serum on damp, towel-dried scalp after cleansing with and treating with a conditioner or hair mask. After applying the hair serum, proceed to blow dry or let hair air dry. Do not rinse.
Should Serum Fortifiant Hair Serum be applied to the hair or scalp?
Serum Fortifiant Hair Serum should be applied to the scalp in order to strengthen hair and prevent hair fall due to breakage from brushing. Apply to parts of the scalp where your hair needs the most strength and in areas where you notice less density
What is the difference between hair-fall and hair-loss?
Hair-loss is defined by > 100 strands falling from the roots per day due to the hardening of collagen hair shaft. Hair-fall is defined by > 100 strands per day falling from the roots due to biological reasons (stress, hormones, diet) OR breakage.
Explore the Genesis Collection
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Customer Reviews
4.6 out of 5 stars 1,757
4.6 out of 5 stars 6,064
4.6 out of 5 stars 2,491
4.7 out of 5 stars 779
4.6 out of 5 stars 5,080
4.4 out of 5 stars 1,703
Price
$50.00$50.00
$46.00$46.00
$46.00$46.00
$68.00$68.00
$50.00$50.00
$64.00$64.00
Hair Type
Hair prone to breakage & fall
Normal to dry, weak hair
Normal to oily, weak hair
Hair prone to breakage & fall
Hair prone to breakage & fall
Hair prone to breakage & fall
Purpose
Light, fortifying conditioner
Fortifying shampoo
Delicate fortifying shampoo
Intense fortifying hair mask
Fortifying heat protectant
Daily fortifying serum
Benefit
Immediate strength & softness
Intensely nourish & detangle
Gentles cleanse & strengthen
Smooth, detangle, & strengthen
Adds shine & prevents frizz
Strengthen hair & reduce fall
Key Ingredient
Ginger root
Ginger root
Ginger root
Ginger root
Ginger root
Ginger root
Usage
Can be used daily
Can be used daily
Can be used daily
Use once a week
Use when blow drying & styling
Can be used daily
Package Dimensions : 4.29 x 1.54 x 1.42 inches; 3.35 ounces
Manufacturer : Kerastase
ASIN : B0G3D8F18H
Best Sellers Rank: #545 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #2 in Hair Styling Serums
Customer Reviews: 4.4 4.4 out of 5 stars (1,703) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
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.