KÉRASTASE Chronologiste Overnight Youth Serum 90ml, Night Hair Treatment, Hydrates & Smooths

KÉRASTASE Chronologiste Overnight Youth Serum is a leave-in night treatment that hydrates, smooths, and revives hair while you sleep.

Designed for hair showing signs of aging such as dryness, dullness, increased frizz and weakened strands, this lightweight serum works overnight to nourish and restore vibrancy. Enriched with Pro-Xylane and Abyssine-derived ingredients from algae, the formula targets fiber resilience and surface smoothness without weighing hair down. The Chromologiste scent profile—bergamot, floral notes and a warm base—turns nightly use into a sensorial ritual as the product works while you rest.

How does this serum improve hair texture by morning?

The formula penetrates the hair fiber to replenish hydration and smooth the cuticle, reducing friction and surface roughness. Within a single application many users report visibly softer, glossier hair and a noticeable drop in flyaways when they wake up.

• Lightweight, leave-in texture that absorbs overnight without residue
• Pro-Xylane helps fortify weakened strands from the inside
• Abyssine-like algae extract targets surface smoothness and shine

Can I use it on all hair types and how do I apply it?

This serum is suitable for most hair types, especially those experiencing dryness, loss of luster, or increased frizz due to aging or environmental stress. Apply a few drops to dry or towel-dried lengths and ends before bed; do not rinse. In the morning, style as usual—no additional rinse needed.

• Works on fine to thick hair; start with a small amount to gauge needs
• Apply primarily to mid-lengths and ends to avoid greasy roots
• Can be layered with other Kérastase styling products in the daytime

What results can I expect and how quickly?

Clinical-style performance indicators from the formula show rapid improvement in surface smoothness and shine after a single overnight use, with cumulative benefits when used regularly. While individual outcomes depend on hair condition and frequency of use, many users notice reduced frizz and a healthier look after the first treatment.

• Noticeable shine and smoothing after one overnight application
• Strengthening effects build with consistent nightly use
• Sensory lift from the Chronologiste fragrance each night

Is the scent strong and will it affect colored or treated hair?

The product carries KÉRASTASE’s signature Chronologiste fragrance—fresh top notes with floral and warm base accords—designed to be pleasant but not overpowering. It is formulated to be compatible with colored and chemically treated hair; however, as with any fragranced treatment, patch testing or a preliminary trial is recommended if you have heightened sensitivity.

• Delicate fragrance balance: bergamot and floral top notes
• Formulated for compatibility with common salon treatments
• Minimal transfer when applied to lengths and ends only

Who this is for: KÉRASTASE Chronologiste Overnight Youth Serum is ideal for people noticing age-related changes in hair—dryness, dullness, frizz and weakened strands—who want an easy, leave-in overnight solution. It suits those seeking a sensorial, low-effort treatment to boost softness, manageability and shine by morning, and works well for anyone who prefers to apply restorative care at night rather than during their daytime routine.

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