If you’ve been noticing more hair on your brush lately, you are not alone. When hair feels weak, it’s more likely to snap during brushing and styling, creating the appearance of hair-fall. While daily shedding is normal, breakage is often the missing piece—especially when you see shorter strands in the sink or brush after heat styling, tight hairstyles, or detangling. The good news: a targeted, fortifying routine can make a visible difference.
The Kérastase Genesis collection is a luxurious, dual-action fortifying haircare system designed to strengthen weak hair with a four-step ritual:
- Cleanse with a strengthening Bain (shampoo) to remove impurities.
- Treat with a Fondant (conditioner) or Masque to reinforce the fiber.
- Activate the scalp with the Genesis Fortifiant Hair Serum.
- Protect against heat damage with Défense Thermique (up to 230°C/450°F).
This routine is backed by brand testing showing 97% less hair-fall due to breakage.
About this guide: This article focuses on hair-fall due to mechanical breakage from brushing and styling. Genesis is a cosmetic haircare routine and is not intended to treat medical hair loss (such as alopecia or hormonal shedding). If you’re concerned about sudden or persistent hair loss from the root, consult a dermatologist for diagnosis.
Inside Genesis: The Fortifying System for Weakened Hair
Kérastase Genesis is a professional hair care system designed for weakened hair that’s prone to hair-fall due to breakage from brushing and daily styling stress. Nearly 88% of women experience this type of breakage-related hair-fall, often triggered by brushing, blow-dry heat, over styling, and stress.
Powered by a fortifying blend of hero ingredients, Genesis supports hair’s resilience through everyday stressors: Arginine helps the fiber at the root, while Edelweiss Native Cells and Ginger Root help fortify and protect against external aggressors that can leave hair feeling fragile.
By pairing a targeted scalp serum with reinforcing shampoos and conditioners, the Genesis line helps build structural resilience, supporting stronger-looking hair from root to tip.
How to Apply Genesis Serum Fortifiant Hair Serum
The Genesis Serum Fortifiant Hair Serum is the cornerstone of the collection, formulated to strengthen hair and reduce breakage. The silicone-free formula is designed for daily use to help preserve the scalp’s protective barrier and support stronger-looking hair at the root.
To achieve optimal results, follow this daily application process:
- Start with dry or freshly washed, towel-dried hair.
- Gently detangle the hair to prepare the scalp.
- Apply 4 doses directly to the scalp in sections.
- Once distributed, apply directly to your scalp with a gentle massage using the pads of your fingertips.
- Do not rinse the product out; leave it in to continuously protect and nourish the scalp.
- Proceed to dry and style your hair as usual.
shop Genesis Serum Fortifiant
Step-by-Step Genesis Routines (Cleanse, Treat, Boost, Protect)
Fine to Medium Hair Routine:
Step 1 (Cleanse):
Cleanse with Bain Hydra-Fortifiant Shampoo to gently cleanse and remove build-up and pollution particles while caring for the lengths. Repeat one time.
Step 2 (Treat):
Use Fondant Renforçateur Conditioner to help reduce hair-fall due to breakage from brushing and reinforce the fiber. Leave the product in for 3 minutes and rinse afterwards.
Step 3 (Boost):
Apply the daily Serum Fortifiant Hair Serum to boost hair’s resilience to breakage from brushing. Apply 4 doses to the scalp in sections and massage.
Step 4 (Protect):
Apply Defense Thermique Heat Protecting Spray before blow-drying and smooth through lengths to protect from heat and ease styling.
Genesis Bain Hydra-Fortifiant Shampoo
Delicate fortifying shampoo for normal to oily, weakened hair that is prone to falling due to breakage from brushing.
Genesis Fondant Renforçateur Conditioner
Lightweight fortifying conditioner for weakened hair that is prone to falling due to breakage from brushing. For daily use.
Genesis Defense Thermique Heat Protecting Spray
Lightweight leave-in spray to strengthen, heat protect, and prevent breakage for weakened hair.
Genesis Serum Fortifiant Hair Serum
Professional-grade daily scalp serum that strengthens hair from the root to prevent breakage from brushing. Salon-quality fortifying treatment for at-home use.
Medium to Thick Hair Routine
Step 1 (Cleanse):
Cleanse with Bain Nutri-Fortifiant Shampoo to reinforce and nourish dry hair. Repeat one time.
Step 2 (Treat):
Use Masque Reconstituant Hair Mask to deeply reinforce lengths and help reduce hair-fall due to breakage from brushing. Leave it in for 5 minutes, then rinse.
Step 3 (Boost):
Apply the daily Serum Fortifiant Hair Serum to boost hair’s resilience to breakage from brushing. Apply 4 doses to the scalp in sections and massage to activate micro-circulation.
Step 4 (Protect):
Apply Defense Thermique Heat Protecting Spray before blow-drying and smooth through lengths to protect from heat and ease styling.
Genesis Bain Nutri-Fortifiant Shampoo
Fortifying shampoo for normal to dry, weakened hair that is prone to falling due to breakage from brushing.
Genesis Masque Reconstituant Hair Mask
Intense fortifying hair mask for weakened hair that is prone to falling due to breakage from brushing. For weekly use.
Genesis Defense Thermique Heat Protecting Spray
Lightweight leave-in spray to strengthen, heat protect, and prevent breakage for weakened hair.
Genesis Serum Fortifiant Hair Serum
Professional-grade daily scalp serum that strengthens hair from the root to prevent breakage from brushing. Salon-quality fortifying treatment for at-home use.
Oily Roots & Dry Lengths Routine
Step 1 (Cleanse):
Cleanse with Bain Hydra-Fortifiant Shampoo to gently cleanse and remove build up and pollution particles while caring for the lengths. Repeat one time.
Step 2 (Treat):
Use Masque Reconstituant Hair Mask to deeply nourish and reinforce lengths against hair-fall due to breakage from brushing. Leave in for 5 minutes, then rinse.
Step 3 (Boost):
Apply the daily Serum Fortifiant Hair Serum to boost hair’s resilience to breakage from brushing. Apply 4 doses to the scalp in sections and massage.
Step 4 (Protect):
Apply Defense Thermique Heat Protecting Spray before blow-drying and smooth through lengths to protect from heat and ease styling.
Genesis Bain Hydra-Fortifiant Shampoo
Delicate fortifying shampoo for normal to oily, weakened hair that is prone to falling due to breakage from brushing.
Genesis Masque Reconstituant Hair Mask
Intense fortifying hair mask for weakened hair that is prone to falling due to breakage from brushing. For weekly use.
Genesis Defense Thermique Heat Protecting Spray
Lightweight leave-in spray to strengthen, heat protect, and prevent breakage for weakened hair.
Genesis Serum Fortifiant Hair Serum
Professional-grade daily scalp serum that strengthens hair from the root to prevent breakage from brushing. Salon-quality fortifying treatment for at-home use.
Defend Against Heat, Reduce Breakage
When hair feels delicate, the priority is fortifying the fiber so it can better resist snapping during brushing, styling, and heat exposure. For a targeted boost, reach for Genesis Defense Thermique Heat Protecting Spray, a fortifying blow-dry fluid that helps protect hair from heat up to 230°C/450°F while supporting smoother, more resilient lengths during daily styling. With consistent use, this resilience-focused approach helps hair better withstand tight updos, thermal tools, and everyday friction for a stronger-looking finish over time.
Deep Conditioning & Structural Reinforcement for Brittle Hair
Genesis Masque Reconstituant Hair Mask is an intensive fortifying hair mask designed for medium to thick hair that needs deeper reinforcement through the lengths. It helps fortify the fiber and support resilience where hair is most likely to weaken over time, especially through the mid-lengths and ends. For an optimal hair mask treatment, cleanse the hair first, apply the rich formula to towel-dried lengths and ends, and leave on for 5 minutes before rinsing thoroughly.
Preventing Split Ends and the Look of Thinning
A healthy, nourished scalp environment is necessary to strengthen hair follicles and maintain strand integrity from the root downward. By fortifying the fiber at its base, you actively prevent hair breakage across the entire shaft. This comprehensive approach mitigates the appearance of hair breakage and thinning, which often mimic actual hair loss but are entirely caused by environmental and mechanical stress. In addition, sealing the cuticle properly reduces hair breakage and split ends, protecting the lengths against ongoing hair breakage and damage caused by friction and heat. For lengths, pairing a reinforcing conditioner or mask with heat protection helps reduce split ends and ongoing breakage caused by friction and styling.
Common Mistakes
- Rinsing out the serum: The Genesis Serum Fortifiant Hair Serum is a leave-in treatment. Rinsing it out immediately removes the active ingredients necessary for scalp fortification.
- Incorrect serum dosage: Applying too little product reduces efficacy. Use 4 doses of the serum (1 dose = 1 pipette up to the mark) to ensure full scalp coverage.
- Applying serum to the lengths: The serum is designed for root stimulation. Apply it directly to the scalp with a gentle massage, then use products like Defense Thermique Heat Protecting Spray from mid-lengths to ends.
- Rushing the mask treatment: Rinsing the mask out like a standard daily conditioner limits its deep-penetrating benefits. Masque Reconstituant Hair Mask is designed to sit for 5 minutes for a true, reinforcing ritual.
Shop The Complete Genesis Routine
Genesis combines the efficacious solution to hair fall due to breakage from brushing with the indulgence of a hair ritual. With Genesis, Never Be Afraid of Falling.
Genesis Bain Hydra-Fortifiant Shampoo
Delicate fortifying shampoo for normal to oily, weakened hair that is prone to falling due to breakage from brushing.
Genesis Bain Nutri-Fortifiant Shampoo
Fortifying shampoo for normal to dry, weakened hair that is prone to falling due to breakage from brushing.
Genesis Fondant Renforçateur Conditioner
Lightweight fortifying conditioner for weakened hair that is prone to falling due to breakage from brushing. For daily use.
Genesis Defense Thermique Heat Protecting Spray
Lightweight leave-in spray to strengthen, heat protect, and prevent breakage for weakened hair.
Genesis Serum Fortifiant Hair Serum
Professional-grade daily scalp serum that strengthens hair from the root to prevent breakage from brushing. Salon-quality fortifying treatment for at-home use.
