KÉRASTASE Premiere Anti-Frizz Hair Repair Serum — Intense Bond Repair, Heat Protection to 450°F, Lightweight Frizz Control

KÉRASTASE Premiere Anti-Frizz Hair Repair Serum is a leave-in treatment that repairs weakened bonds, tames frizz and protects hair from heat while adding shine.

This lightweight serum from KÉRASTASE is designed for damaged, fragile or frizz-prone hair. It combines peptide technology and glycine to rebuild the internal structure of strands, while also delivering external smoothing and humidity resistance. The formula works as a leave-in defense that helps reduce breakage and split-end appearance, shields hair up to 450°F, and makes hair easier to style.

How does this serum repair hair without weighing it down?

The serum uses small, targeted molecules — including peptides — to reinforce weakened keratin links inside the fiber, while glycine helps reconnect broken bonds. Because the concentrate is low in heavy oils, it smooths the cuticle without leaving residue, preserving natural movement and volume.

• Peptide-rich formula strengthens internal bonds.
• Glycine helps reconnect keratin chains for reduced breakage.
• Lightweight, non-greasy texture for natural bounce.
• Leave-in application avoids buildup from rinse-out treatments.

Will it control frizz and humidity on humid days?

The serum forms a protective layer that repels moisture from the air, minimizing frizz and surface roughness. It helps hair appear smoother for longer and reduces the visual impact of split ends that can exacerbate frizz.

• Humidity-resistant finish to help keep strands aligned.
• Reduces the appearance of split ends that catch humidity.
• Enhances manageability for easier styling in damp conditions.

Can I use it with heat tools and daily styling products?

Yes — the serum offers heat protection up to 450°F, making it suitable for blow-drying, straightening and hot tools when used as directed. It layers well under other styling products and helps prevent tool-related breakage when applied to towel-dried hair before heat.

• Heat protection rated to 450°F for styling safety.
• Apply on damp hair before blow-drying or heat styling.
• Compatible with styling creams and sprays without greasiness.

How quickly will I notice results and what changes should I expect?

Many users notice improved smoothness and easier styling after the first use; structural strengthening and reduced breakage develop with regular use. Expect visibly smoother hair, a reduction in split-end appearance and increased shine over several applications.

• Immediate smoother texture and easier detangling after application.
• Progressive reduction in breakage with continued use.
• Enhanced shine and less visible split ends over time.

Who is this for: This serum is intended for people with damaged, chemically treated, heat-styled or frizz-prone hair who want bonded repair plus styling protection. It suits those who prefer a lightweight leave-in treatment that supports strength, smoothness and humidity resistance without flattening the hair.

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