KÉRASTASE Hair Strengthening Serum — Genesis Daily Anti-Breakage Treatment, Silicone-Free, 1 fl oz

This concentrated 1 fl oz serum is designed to strengthen brittle strands and help hair resist breakage caused by mechanical stress like brushing. The clear, fast-absorbing formula targets roots and areas of low density to nourish and fortify hair without leaving a heavy residue. Use it alone or as part of the Genesis regimen to support smoother, stronger-looking hair over time.

How does this serum help reduce breakage from brushing?

The serum focuses on improving hair resistance where it’s most fragile. Key actives such as ginger and caffeine help support scalp vitality while arginine supports circulation to the hair root, creating a better environment for stronger strands. Applied directly to the scalp and lengths, the formula leaves hair more resilient to everyday mechanical stress.

• Targets fragile zones and areas with less density
• Lightweight texture that won’t weigh hair down or leave residue
• Daily application reinforces hair over repeated use
• Reduced breakage after brushing reported by most users

What are the active ingredients and what do they do?

Ginger and caffeine are included to help invigorate the scalp and support hair resistance, while arginine contributes to healthy microcirculation at the follicle level. The serum is silicone-free, so it strengthens without silicones that can build up over time. These ingredients work together to nourish strands and promote a stronger hair fiber with repeated use.

• Ginger: scalp-supporting, refreshing component
• Caffeine: helps target stressed areas and improve resilience
• Arginine: supports blood flow to the hair root
• Silicone-free: lightweight, non-greasy finish

How do I use the Genesis Hair Serum for best results?

Apply four doses section by section to a dry or towel-dried scalp, then massage gently to distribute. Use once daily—morning or evening—for at least six weeks to evaluate improvements. The serum is leave-in, so do not rinse; style as usual after application.

• Apply on dry or towel-dried scalp only
• Four doses per application, section the scalp for even coverage
• Massage to encourage absorption; do not rinse
• Use daily for a minimum of six weeks for measurable results

Can I combine this serum with other Genesis products?

Yes — the serum integrates with the Genesis collection to amplify strengthening benefits. Pair it with Bain Nutri-Fortifiant Shampoo, Fondant Renforcateur Conditioner, and Defense Thermique Primer for a full routine that addresses both roots and lengths. Each product complements the serum’s anti-breakage focus without overlapping ingredients.

• Works with Genesis shampoo and conditioner for fuller routine benefits
• Compatible with heat protectant and leave-in treatments
• Designed for normal to dry, weakened hair types
• Serum remains effective as a targeted, daily treatment

Who is this for? The KÉRASTASE Genesis Hair Serum is aimed at people with weakened, brittle hair who notice breakage from brushing or mechanical stress and want a lightweight, leave-in strengthening solution. It suits normal to dry hair textures, can be applied to areas of low density, and fits into existing styling routines without silicones or heavy buildup. Ideal for users seeking targeted reinforcement and a daily, easy-to-use treatment that complements a complete hair-strengthening regimen.