KÉRASTASE Resistance Extentioniste Scalp & Hair Serum 1.7 oz — Leave‑In Energizing Formula with Ceramides for Soothing, Strengthen

KÉRASTASE Resistance Extentioniste Scalp & Hair Serum is a concentrated leave-in treatment that soothes the scalp and strengthens hair to support healthier lengths and repair damaged ends.

This lightweight, non-greasy serum is formulated with ceramides to reinforce fragile hair fibers from the root to the tip while calming and protecting the scalp. Designed for all hair types—especially weakened, damaged, or sensitized hair—the Extentioniste Scalp Serum works as part of a routine to reduce breakage, decrease split ends, and improve elasticity without weighing hair down. Use once or twice weekly as a targeted booster for longer, more resilient strands.

How does this serum help fragile hair grow longer?

The formula focuses on strengthening hair structure rather than forcing faster growth. Ceramides help rebuild the cortex and improve elasticity so hair resists breakage as it lengthens, meaning more visible length retention over time. The scalp-soothing ingredients create a healthier foundation for hair to develop.

• Reinforces hair fiber to reduce breakage and preserve length
• Improves elasticity to prevent snapping during styling
• Targets roots and strands with a lightweight, leave-in application

How should I apply the Extentioniste Scalp Serum for best results?

Apply the serum directly to a dry or towel-dried scalp using the pipette; three pipettes per application is recommended. Massage gently across sections so the product reaches roots, then style as usual—no rinsing required. For maintenance, use once or twice weekly depending on hair condition and styling frequency.

• Use 3 pipettes per session for even coverage
• Massage into scalp across multiple sections to ensure penetration
• Leave in and proceed with regular styling; do not rinse

Will this serum make my hair greasy or weigh it down?

No—this leave-in treatment is formulated to be non-greasy and lightweight so it won’t flatten fine hair or leave residue. It absorbs into the scalp and fiber to deliver strengthening ceramides and conditioning benefits while keeping natural movement. If you have very fine hair, apply only to problem areas or reduce frequency until you find the ideal amount.

• Non-greasy texture preserves volume and natural movement
• Absorbs quickly to avoid visible buildup on roots
• Adjust frequency or spot-treat for fine or oily hair types

Who is this for: KÉRASTASE Resistance Extentioniste Scalp & Hair Serum suits anyone aiming to protect and lengthen weakened hair—those with split ends, frequent styling damage, or sensitized scalps will see the most benefit. Use it alongside the Extentioniste Shampoo and Conditioner for a complete regimen focused on stronger hair and a soothed, protected scalp. Ideal for all hair types seeking improved resilience and healthier-looking lengths.

Ingredients

Water, Polyquaternium-37, Paraffinum Liquidum / Mineral Oil, Amodimethicone, Polysorbate 2, Quaternium-7, Stearyl Alcohol, Menthoxypropanediol, Behentrimonium Chloride, Safflower Glucoside, Maltodextrin, Propylene Glycol, Candelilla Cera / Candelilla Wax, Ppg-1 Trideceth-6, Propanediol, Chlorhexidine Digluconate, Isopropyl Alcohol, Trideceth-6, Acrylates Copolymer, Sorbitan Oleate, Polyquaternium-11, Rose Extract, 2-Oleamido-1, 3-Octadecanediol, Cetrimonium Chloride, Camellia Sinensis Leaf Extract, Xanthan Gum, Tocopherol, Bht, Sodium Citrate, Fragrance.