KÉRASTASE Resistance Serum Therapiste — Repairing Leave-In Serum for Very Damaged Hair, 450°F Heat Protect

KÉRASTASE Resistance Serum Therapiste is a leave-in repairing serum that reconstructs very damaged lengths, deeply hydrates and protects hair from heat up to 450°F.

This lightweight serum targets weakened, over-processed hair by rebuilding fiber strength and restoring softness without weighing hair down. Formulated with Gluco Peptide, a wheat protein derivative and native plant cells, it provides nutrition and improves elasticity while soothing the scalp. Use it as a pre-styling treatment before blow-drying or as a finishing touch to tame flyaways and disguise split ends.

How does this serum repair extremely damaged hair?

The formula focuses on reconstructing compromised hair fiber to return strength and manageability. Gluco Peptide helps reinforce existing strands while wheat protein derivatives improve flexibility, reducing the look and feel of brittleness.

• Rebuilds fiber structure with Gluco Peptide
• Improves elasticity using wheat protein derivatives
• Native plant cells deliver lasting hydration to dry lengths

Can it protect my hair during heat styling?

Yes — the serum provides thermal protection rated up to 450°F (232°C), making it suitable for blow dryers and hot tools when used as directed on towel-dried hair. It forms a protective layer that helps prevent additional damage from high temperatures.

• Use 1–2 pumps on towel-dried mid-lengths and ends before blow-drying
• Creates a shield against high-heat styling tools
• Helps maintain softness even after heat exposure

How should I incorporate it into my hair routine?

Apply the serum as a leave-in treatment after washing: distribute 1–2 pumps through towel-dried mid-lengths to ends, then blow-dry or style as usual. For quick touch-ups, smooth a small amount onto dry hair to control frizz and conceal split ends without greasiness.

• Daily use on towel-dried hair before heat styling
• Lightly apply to dry ends to finish and reduce flyaways
• Complement with Resistance Extentioniste Conditioner and Therapiste Hair Mask for a full repair regimen

What immediate benefits will I notice after using it?

Expect softer, more manageable hair with reduced roughness and visible improvement in texture. The serum leaves hair feeling silkier to the touch while delivering thermal defense and enhanced elasticity over repeated use.

• Instant smoothing and reduced friction
• Enhanced shine and easier detangling
• Progressive strengthening with continued application

Who is this for: KÉRASTASE Resistance Serum Therapiste is designed for people with very damaged, brittle or over-processed hair who need intensive repair plus reliable heat protection. It suits those who regularly use hot tools or chemical services and want a lightweight, leave-in treatment that restores softness, reinforces length and controls frizz without heavy residue. For best results, add it to a Resistance routine with the Extentioniste Conditioner and Therapiste Hair Mask to rebuild and protect hair over time.

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.