KÉRASTASE Anti-Frizz Hair Repair Serum — For Breakage & Damaged Hair, 450°F Heat Protection

KÉRASTASE Premiere Anti-Frizz Hair Repair Serum is a leave-in strengthening serum that repairs damaged strands, seals split ends and shields hair from heat up to 450°F while controlling frizz.

This lightweight, non-greasy serum is formulated to reconnect weakened keratin links and fortify hair fiber so styling looks smoother and shinier. Powered by peptides to reinforce the strand and glycine to help reconnect broken bonds, the formula works on all damaged hair types—whether from color, heat, chemical services or mechanical stress. It’s meant to be applied to towel-dried hair and left in before blow-drying or air-drying, delivering visible improvements in smoothness, shine and resistance to breakage.

How quickly will I see smoother, less-frizzy hair?

Many users notice reduced flyaways and a smoother surface immediately after application and styling. Results continue to improve with regular use as the peptides and bond-repairing agents strengthen fibers over time.

• Immediate smoothing of flyaways after blow-dry
• 3x smoother appearance versus unwashed hair*
• Progressive reduction in breakage with repeated use

What kind of heat and humidity protection does it provide?

The serum creates a protective coating that helps resist thermal stress and humidity, allowing you to style with higher temperatures while limiting frizz. It’s formulated to protect hair from styling tools up to 450°F and to repel moisture that causes frizz.

• Heat protection rated up to 450°F for secure styling
• Humidity-repellent finish to maintain sleekness
• Supports longer-lasting styles in damp conditions

Which ingredients repair damage and reduce split ends?

Key actives include peptides that strengthen the hair shaft and glycine, an amino acid that helps reconnect broken keratin links inside the fiber. Together these ingredients reduce breakage and improve the appearance of split ends without weighing hair down.

• Peptides: reinforce and rebuild strand strength
• Glycine: helps reconnect and smooth broken keratin chains
• Lightweight emollients: lock in shine without greasiness

How do I use it for best results?

Apply a small amount to towel-dried hair, focusing on mid-lengths and ends. Leave the serum in—no rinse needed—then blow-dry or air-dry and style as usual. Regular use after cleansing and conditioning yields the best cumulative repair benefits.

• Use on towel-dried hair before styling
• Concentrate product on weakened mid-lengths and ends
• Leave in; blow-dry or air-dry and style as desired

Who is this for: KÉRASTASE Premiere Anti-Frizz Hair Repair Serum suits anyone with damaged, brittle, chemically treated, heat-stressed or frizz-prone hair seeking a lightweight, leave-in solution. It’s ideal for people who regularly heat-style, color-treat, or want to visibly reduce split ends while improving smoothness and shine. Suitable for all hair textures, it complements a stronger haircare routine when used alongside a nourishing shampoo and conditioner.

*3x smoother and 85% more shine versus unwashed hair; 99% stronger hair versus non-conditioning shampoo, as reported in product testing.

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