KÉRASTASE Chronologiste Heat Protectant Hair Serum, 5.1 fl oz — Argan Oil & Frizz Control

KÉRASTASE Chronologiste Hair Serum is a leave-in primer that shields hair from heat up to 450°F while smoothing, strengthening and locking out humidity for frizz-free styling.

This lightweight, cosmetically elegant serum is designed to be applied to damp hair before blow-drying and heat styling. Formulated with a blend of argan, marula and camellia oils, it aims to add slip, shine and hydration while creating a protective barrier against mechanical and thermal stress. The result is hair that looks smoother and feels more resilient without heaviness or residue.

How does this serum protect hair from heat and styling damage?

The Chronologiste serum forms a heat-resistant layer across the hair strand that reduces breakage and split ends caused by thermal tools. It helps distribute heat more evenly during styling and provides temporary reinforcement to weakened areas of the fiber.

• Heat protection rated up to 450°F for blow-dryers, flat irons and curling wands
• Creates a slip that reduces friction from brushes and styling tools
• Helps prevent breakage during repeated styling by strengthening the strand surface

Will this control frizz and humidity on humid days?

Yes — the formula targets moisture exchange at the hair surface to minimize frizz for up to 24 hours, even in high-humidity conditions. Its oil blend smooths the cuticle, reducing the hair’s tendency to swell and tangle when moisture levels spike.

• Provides up to 24-hour frizz control in up to 80% humidity
• Oil complex (argan, marula, camellia) smooths and seals the cuticle
• Lightweight finish avoids sticky buildup while maintaining manageability

How do I use Chronologiste Hair Serum for best results?

Apply after cleansing and conditioning—best when used following Chronologiste shampoo and mask for a complete regimen. Work a small amount through damp lengths and mid-lengths, then leave in and style with heat as desired; no rinse needed.

• Use a pea-to-nickel sized amount depending on hair length and thickness
• Distribute evenly from mid-lengths to ends; avoid roots to prevent weighing down
• Blow-dry and style; reapply a tiny amount to dry ends for added sheen if necessary

What improvements can I expect in dryness, brittleness and shine?

The nourishing oils deliver immediate surface hydration and visible shine while helping reduce the appearance of split or brittle ends over time. Regular use within the Chronologiste routine supports smoother texture and more elastic-feeling hair.

• Immediate smoothing and increased shine without greasiness
• Helps reduce breakage and strengthen fragile strands with routine use
• Leaves hair supple, easier to comb and style

Who is this for: KÉRASTASE Chronologiste Hair Serum is aimed at anyone with dry, brittle, sensitized or mature hair looking for a lightweight, leave-in protective product that supports heat styling. It suits fine to mid-weight textures that need humidity resistance and frizz control without heavy oils, and works well as part of a fuller Chronologiste regimen to restore moisture, bounce and shine.

Ingredients

Water, Beeswax, Dimethicone, Isopropyl Myristate, Phenoxyethanol, Hydroxypropyl Guar, Peg-40 Hydrogenated Castor Oil, Triethanolamine, Hydroxyethylcellulose, Caprylyl Glycol, Dimethiconol, Peg-30 Glyceryl Stearate, Hydrogenated Styrene/Butadiene Copolymer, Ethylhexylglycerin, Benzyl Salicylate, Hexyl Cinnamal, Acrylates/C10-30 Alkylacrylate Crosspolymer, Benzyl Alcohol, Disodium Stearoyl Glutamate, Limonene, Citronellol, Tocopherol, Bisabolol, Sodium Hyaluronate, Safflower Glucoside, Geraniol, Hydroxycitronellal, Coumarin, Butylene Glycol, Peg-30 Dipolyhydroxystearate, Trideceth-6, Linalool, Farnesol, Alteromonas Ferment Extract, Sodium Citrate, Parfum/Fragrance, C243628/1.