KÉRASTASE Repairing Hair Serum Therapiste — Restores Damaged Hair, 450°F Heat Protect

KÉRASTASE Resistance Serum Therapiste is a leave-in repairing serum that rebuilds very damaged lengths, delivers deep hydration, and provides thermo-protection up to 450°F.

This lightweight, leave-in serum targets weakened, brittle hair and split ends by replenishing moisture, increasing flexibility, and shielding strands during heat styling. Formulated with Gluco Peptide, a wheat protein derivative, and native plant cells, it works to reconstruct fiber while offering a soothing texture that reduces friction and flyaways. Use it after washing on towel-dried hair before blow-drying, or apply sparingly on dry hair as a finishing step.

How does this serum repair very damaged hair?

The formula focuses on reinforcing the hair fiber and restoring elasticity rather than masking damage. Protein and peptide ingredients help reconnect weakened areas of the strand while hydrating agents smooth the surface for softer, more manageable hair.

• Gluco Peptide strengthens existing hair fibers to reduce breakage.
• Wheat protein derivative restores flexibility and resilience.
• Native plant cells supply targeted hydration to dry lengths and ends.
• Light texture leaves hair soft without weighing it down.

Will this protect my hair during heat styling?

Yes — the serum is formulated to shield hair from high-temperature styling tools, helping limit further damage when blow-drying or using hot irons. It forms a protective layer that reduces heat-related stress on fragile strands.

• Thermo-protection rated up to 450°F (approximately 232°C).
• Apply before heat styling for optimal protection and smoother results.
• Helps prevent additional split ends and dryness caused by hot tools.

How should I use the serum for best results?

Dispense a small amount and distribute from mid-lengths to ends on towel-dried hair, then proceed to blow-dry or style as usual. For touch-ups on dry hair, a light dab smooths flyaways and disguises split ends without greasiness.

• 1–2 pumps per application on medium to long hair; adjust for thickness and length.
• Use on damp hair before blow-drying to rebuild and protect during styling.
• Apply sparingly to dry ends as a finishing product to tame frizz.
• Combine with Resistance Extentioniste Conditioner and Therapiste Hair Mask for a complete repair routine.

What sensory and practical benefits can I expect?

The serum offers a soothing, non-greasy texture that improves combability and leaves hair feeling softer to the touch. It reduces friction and split-end visibility while providing long-lasting manageability for weakened hair.

• Soft, silky finish without heavy residue.
• Helps calm scalp sensitivity with its comforting texture.
• Reduces tangling for easier styling and less mechanical breakage.

Who is this for: KÉRASTASE Resistance Serum Therapiste is designed for people with weak, very damaged or over-processed hair who want to rebuild fiber strength, add hydration, and protect strands from heat styling. It suits those who regularly use hot tools, color-treated hair in need of targeted repair, and anyone looking to reduce frizz, improve elasticity, and make lengths and ends softer and more manageable when used within a Resistance regimen.

Ingredients

Cyclopentasiloxane, Dimethiconol, Dimethicone, Cetearyl Alcohol, Phenyl Trimethicone, Amodimethicone, Phenoxyethanol, Polyquaternium-37, Trideceth-5, Propylene Glycol Dicaprylate/Dicaprate, Steareth-20, Cetyl Hydroxyethylcellulose, Linalool, Glycerin, 2-Oleamido-1,3-Octadecanediol, Citronellol, Trideceth-10, Ppg-1 Trideceth-6, Geraniol, Glycine, Arginine, Proline, Tyrosine, Glutamic Acid, Chlorhexidine Digluconate, Serine, Benzyl Alcohol, Hydroxypropyltrimonium Hydrolyzed Wheat Protein, Isoeugenol, Safflower Glucoside, Alpha-Isomethyl Ionone, Trehalose, Tamarindus Indica Seed Polysaccharide, Myrothamnus Flabellifolia Leaf Extract, Fragrance.