KÉRASTASE Premiere Hair Repair Serum for Damaged Hair — 450°F Heat Protection, Split-End Repair

This lightweight serum is formulated to rebuild and protect fragile hair. It combines targeted rebuilding ingredients with a heat- and humidity-resistant finish to reduce breakage, tame frizz, and enhance shine without weighing hair down. Ideal to use after washing on towel-dried hair, it’s designed to be left in and styled with heat tools or air-dried for lasting manageability.

How does this serum repair and strengthen broken hair fibers?

The formula uses peptide technology and amino acids to reconnect and reinforce weakened protein links inside the hair fiber. These actives help reduce the appearance of split ends and improve tensile strength, so strands bend and move with less breakage over time.

• Peptides to fortify and smooth the hair cortex
• Glycine to reconnect keratin chain links
• Visible reduction in split-end appearance with continued use

Will it protect my hair when I blow-dry or use a flat iron?

Yes — the serum provides thermal protection rated up to 450°F, making it suitable for most styling tools. It forms a protective layer that helps prevent heat-related weakening while promoting a sleeker finish that is easier to style.

• Heat protection up to 450°F for styling security
• Lightweight texture that won’t make hair greasy
• Works under blow-drying, flat irons, and curling tools

How does it control frizz and react to humidity?

The product repels humidity and locks out moisture that causes frizz, so hair stays smoother and more defined in humid environments. The finish helps maintain three times smoother hair texture compared with unwashed hair, improving manageability throughout the day.

• Humidity-resistant barrier to minimize frizz
• Leaves hair visibly smoother and easier to comb
• Helps maintain style shape in damp conditions

How do I use it for best results?

Apply a small amount to towel-dried hair from mid-lengths to ends, then leave in—no rinse needed. You can blow-dry or air-dry and finish with your usual styling routine; repeated use builds stronger-looking, glossier hair over time.

• Use on towel-dried hair after shampoo and conditioner
• Distribute evenly through mid-lengths and ends; avoid the roots
• Leave in and style as usual for thermal protection and shine

Who is this for: KÉRASTASE Premiere Hair Repair Serum suits people with chemically treated, heat-styled, or mechanically stressed hair who want to reduce breakage, tame split ends, and protect styles from heat and humidity. It performs well for anyone seeking a lightweight leave-in that rebuilds fiber strength while adding noticeable smoothness and shine without heaviness.

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