KÉRASTASE Première Anti-Frizz Hair Repair Serum — Lightweight Leave-In, Heat Protection to 450°F for Damaged Hair

KÉRASTASE Première Anti-Frizz Hair Repair Serum is a lightweight leave-in treatment that repairs weakened fibers, controls frizz, and shields hair from heat up to 450°F for sleeker, stronger-looking hair.

This concentrated serum combines peptides and glycine to target damage along the hair fiber, reconnecting broken keratin links and smoothing the cuticle. Designed for all damaged hair types, it works as a daily leave-in to reduce the visible appearance of split ends, repel humidity, and add slip for easier styling. The formula aims to make hair feel more resilient while also boosting shine and manageability without weighing strands down.

How does this serum strengthen and repair fragile hair?

The formula uses targeted ingredients to reinforce the hair structure and reduce breakage during styling. Peptides help fortify weakened strands while glycine assists with reconnecting disrupted keratin chains, improving tensile strength and flexibility.

• Peptides: support internal fiber reinforcement.
• Glycine: helps bridge gaps in keratin links.
• Lightweight base: leaves no heavy residue for natural movement.
• Daily leave-in use: cumulative improvement with regular application.

Will it protect my hair when I heat-style and live in humid climates?

Yes — the serum provides thermal protection up to 450°F and contains anti-humidity agents to lock out frizz. That combination helps preserve style integrity and reduces the likelihood of humidity-triggered flyaways after blow-drying or flat-ironing.

• Heat defense: protection up to 450°F for safer styling.
• Humidity control: repels moisture to minimize frizz.
• Smoother finish: enhances comb-through and styling slip.
• Compatibility: works before blow-drying, straightening, or air-drying.

How will this product change the look and feel of my split ends and shine?

Regular application visibly reduces the appearance of split ends while adding noticeable shine and smoothness. Users report improved surface integrity and a glossier look compared with unwashed, untreated hair.

• Split-end appearance reduced: helps hair look healthier at lengths.
• 3x smoother feel: eases tangling and styling.
• Up to 85% more shine: boosts surface luminosity for a polished finish.
• Doesn’t replace trims: complements maintenance to extend healthy appearance.

How do I use this serum for best results?

Apply to towel-dried hair as a leave-in treatment, distributing from mid-lengths to ends. Follow with blow-drying or styling as usual; the product is designed to act as a protective and reparative base for heat tools and everyday styling.

• Step 1: Towel-dry hair to remove excess water.
• Step 2: Dispense a small amount and work through mid-lengths and ends.
• Step 3: Do not rinse; blow-dry or style as desired.
• Tip: Use sparingly on fine hair to avoid buildup; increase for thicker, more damaged lengths.

Who is this for: KÉRASTASE Première Anti-Frizz Hair Repair Serum suits anyone with weakened, chemically or mechanically stressed hair seeking a leave-in solution that strengthens fibers, reduces visible split ends, and controls frizz during heat styling and humid conditions. It’s ideal for clients who want salon-grade repair benefits without heavy conditioning, and for those who style frequently and need thermal protection and added shine.

Ingredients

AQUA / WATER / EAU • ISOPROPYL MYRISTATE • DIMETHICONE • TRIETHANOLAMINE • AMODIMETHICONE • PARFUM / FRAGRANCE • PHENOXYETHANOL • CARBOMER • POLYQUATERNIUM-4 • POTATO STARCH MODIFIED • LIMONENE • HYDROXYPROPYL GUAR • BEHENTRIMONIUM CHLORIDE • HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL • GLYCINE • TRIDECETH-6 • ISOPROPYL ALCOHOL • LINALOOL • CETRIMONIUM CHLORIDE • CITRAL • COUMARIN • BENZYL SALICYLATE • SODIUM BENZOATE • BENZYL ALCOHOL • CITRONELLOL • ALPHA-ISOMETHYL IONONE • POTASSIUM SORBATE • GERANIOL