Price: $33.00
(as of Apr 17, 2026 18:39:20 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
Will this make my roots greasy?
The Serum Fortifiant is a silicone-free, lightweight formula designed to absorb quickly into the scalp without leaving residue or oiliness.
How much should I use per application?
Fill the pipette to the black dosage line. This equals one dose. We recommend using 4 doses to cover the entire scalp.
Can I use this on dry hair?
Yes, the serum can be applied to both towel-dried hair after washing or dry hair on non-wash days.
Explore the Genesis Collection
Add to Cart
Add to Cart
Add to Cart
Add to Cart
Add to Cart
Add to Cart
Customer Reviews
4.6 out of 5 stars 1,851
4.6 out of 5 stars 6,310
4.6 out of 5 stars 2,658
4.7 out of 5 stars 813
4.6 out of 5 stars 5,239
4.5 out of 5 stars 1,922
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 : 4.13 x 1.54 x 1.46 inches; 3.67 ounces
Manufacturer : Kerastase
ASIN : B0G3D8F18H
Best Sellers Rank: #860 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #13 in Hair Loss Products
Customer Reviews: 4.5 4.5 out of 5 stars (1,922) 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.
