Buy it9.6/10
✱ Best Overall
+ Overall thinning and reduced density
− At around $125, considerably more expensive than most cosmetic hair serums.
Buy it✱ Best for Hair Fall From Breakage
Kérastase Genesis Serum Fortifiant
8.8/10Verdict Lab Score · Buy it
Best forWeak, breakage-prone hair
DrawbackNot a treatment for androgenetic hair loss.
Key ingredientsStrengthening complex
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✱ The verdict
Why it scores
8.8 out of 10
Kérastase Genesis works differently from the products above it. Instead of aggressive growth claims, it strengthens weakened hair from the root and reduces fall caused by breakage.
The brand reports up to 97% less hair fall due to breakage from brushing, which makes it ideal when hair looks thinner because fragile strands snap, not because follicles have stopped producing.
Why we ranked it #7
↗Targets breakage-related hair fall
↗Lightweight texture
↗Daily scalp application
↗Strong salon-brand reputation
↗3,000+ reviews on the U.S. brand site
How it compares
hair growth serums
Full ranking ↗RankProductBest forKey ingredientsScore
02Briogeo Destined for Density MegaStrength+ Peptide Density SerumDensityCopper peptides, caffeine, niacinamide9.5
04The Ordinary Multi-Peptide Serum for Hair DensityBest ValuePeptides, caffeine, Procapil, Redensyl9.2
10Briogeo Scalp Revival Charcoal + Tea Tree Scalp TreatmentSensitive ScalpCharcoal, tea tree, aloe8.3
Related
verdicts
All reviews ↗Buy it
Buy it9.5/10
✱ Best Clinical Cosmetic Formula
+ Hair density and thinning
− Requires consistent daily use for several months.
Buy it9.3/10
✱ Best for Early Thinning
+ Early signs of reduced density
− Clinical evidence is less robust than established pharmaceutical hair-loss treatments.
Buy it9.2/10
✱ Best Value
+ Budget-conscious users and early thinning
− Less clinical data on the finished product than some premium competitors.