KÉRASTASE Chronologiste Overnight Youth Serum 1 fl oz — Mini leave-in night treatment to reduce frizz & boost shine

KÉRASTASE Chronologiste Mini Overnight Youth Serum is a leave-in, overnight treatment designed to reduce frizz, boost shine, and strengthen aging hair while you sleep.

This compact 1 fl oz formula blends Pro-Xylane™ and Ochrophyta Algae to target visible signs of hair aging without rinsing. Lightweight and fragrance-forward, the serum is made to fit into a nightly routine: apply to dry or damp hair before bed and wake to softer, more manageable strands. The texture absorbs quickly, delivering intensive hydration and a sensorial layer of bergamot, freesia, and patchouli for a luxe bedtime experience.

How does this overnight serum improve hair by morning?

The serum works continuously as you sleep to hydrate, smooth the cuticle, and calm surface frizz. Its leave-in formula allows active ingredients to act over several hours without weighing hair down, so you wake with enhanced shine and feel.

• Pro-Xylane™ helps reinforce fiber structure and resilience.
• Ochrophyta Algae adds moisture and hair-surface calming properties.
• Light, non-greasy texture for uninterrupted overnight absorption.
• Fragrance notes mask product scent and add a pleasant bedtime ritual.

Will the serum weigh my hair down or leave a residue?

No. The Chronologiste Overnight Youth Serum is formulated to be lightweight and non-greasy, absorbing into the fiber rather than coating it. It’s intended for use on both damp and dry hair and does not require rinsing in the morning.

• Fast-absorbing base minimizes heaviness on roots and lengths.
• Designed for leave-in use—no morning rinse needed.
• Suitable for use on finer hair when applied sparingly to mid-lengths and ends.

What measurable results can I expect from the first use?

Clinical data supplied with the formula show noticeable changes after one application, reflecting the serum’s intensive overnight action. While individual results vary, early improvements commonly reported include reduced frizz, more visible shine, and increased hair strength.

• 66% less frizz after a single use (per brand testing).
• 32% more shine reported immediately following overnight treatment.
• 92% stronger hair fibers in controlled assessments.

How do I incorporate this into my nightly hair routine?

Using the serum is quick and adaptable: apply a small amount to dry or towel-dried hair before bed, then style or braid as usual. There’s no need to rinse—simply let the active ingredients work overnight and style in the morning as desired.

• Dispense a pea-to-nickel-sized amount for short hair; increase for longer lengths.
• Distribute evenly from mid-lengths to ends; avoid heavy application at the scalp.
• Can be combined with other leave-in treatments or used on its own for a simplified regimen.

Who is this for: KÉRASTASE Chronologiste Mini Overnight Youth Serum is aimed at anyone noticing signs of hair aging—such as increased frizz, loss of smoothness, or weakened fiber—and seeking a simple, overnight-acting leave-in treatment. It suits those who prefer minimal morning maintenance and enjoy a scent-forward, spa-like experience at home. The mini 1 fl oz size is also ideal for trial, travel, or gift-giving when you want targeted overnight correction without committing to a full-size bottle.

Ingredients

AQUA / WATER / EAU • DIMETHICONE • GLYCERIN • ISOPROPYL MYRISTATE • PHENOXYETHANOL • POLYACRYLAMIDE • C13-14 ISOALKANE • LAURETH-7 • BENZYL SALICYLATE • HEXYL CINNAMAL • BENZYL ALCOHOL • LINALOOL • TETRAMETHYL ACETYLOCTAHYDRONAPHTHALENES • CARVONE • CITRUS AURANTIUM PEEL OIL • LIMONENE • POGOSTEMON CABLIN OIL • CITRONELLOL • LINALYL ACETATE • GERANIOL • HYDROXYCITRONELLAL • MACROCYSTIS PYRIFERA EXTRACT / KELP EXTRACT • HYDROXYPROPYL TETRAHYDROPYRANTRIOL • BENZALDEHYDE • GERANYL ACETATE • COUMARIN • CITRIC ACID • TRIMETHYLBENZENEPROPANOL • ROSE KETONES • PROPYLENE GLYCOL • BETA-CARYOPHYLLENE • POTASSIUM SORBATE • SODIUM BENZOATE • PARFUM / FRAGRANCE