KÉRASTASE Chronologiste Overnight Youth Serum Travel Size 1.01 fl oz — Age-Corrective Leave-In, Anti-Frizz & Strengthening

KÉRASTASE Chronologiste Overnight Youth Serum is a leave-in, age-corrective overnight treatment that helps reduce frizz, boost shine and reinforce weakened hair while you sleep.

The Chronologiste Overnight Youth Serum by KÉRASTASE is formulated to target visible signs of hair aging—loss of strength, surface roughness and frizz—using a concentrated blend of Pro‑Xylane™ and Ochrophyta algae. This travel-size 1.01 fl oz bottle delivers the brand’s luxury hair-care technology in a lightweight, non-rinsing serum designed for nightly use. The texture absorbs quickly, layers comfortably under sleepwear, and leaves a subtle fragrance of bergamot, freesia and patchouli for a sensorial finish.

How does this serum work while I sleep?

The serum acts as a leave-in corrective treatment that penetrates the hair fiber and smooths the surface overnight. Ingredients like Pro‑Xylane™ help support strength and structure, while Ochrophyta algae smooth the cuticle to reduce friction and frizz. Use consistently to benefit from nightly restorative effects without rinsing in the morning.

• Apply to dry or damp hair before bed; no rinsing required.
• Lightweight texture absorbs overnight without weighing hair down.
• Formulated to reduce friction and surface roughness for easier styling next day.

What visible improvements can I expect after using it?

After a single application users report reduced frizz, improved shine and reinforced hair feel; continued use supports smoother, more manageable strands. The formula focuses on cosmetic improvement—smoother surfaces reflect light better and detangle more easily. Results depend on hair type and condition, but the serum is optimized for hair weakened by age-related changes.

• Noticeably less frizz and flyaways for a sleeker appearance.
• Enhanced shine due to smoother cuticles and light reflection.
• Improved comb-through and styling manageability after sleep.

How do I use the travel-size bottle for best results?

Dispense a small amount into palms, rub together and distribute through lengths and ends—avoid the scalp to prevent buildup. The travel-friendly 1.01 fl oz size is ideal for trips or trialing the formula. Use nightly on dry or damp hair, and style as usual in the morning for best effect.

• Start with a pea-to-dime sized drop depending on hair length and thickness.
• Concentrate on mid-lengths and ends where aging signs are most visible.
• Layer under other night treatments if desired; do not rinse out.

Is this serum safe for color‑treated or heat‑styled hair?

The formula is designed to be compatible with color-treated and heat-styled hair, adding smoothing and strengthening benefits without stripping color. Because it’s a lightweight, non-rinse serum, it won’t interfere with professional color results when used as directed. If you have a sensitive scalp or specific treatment concerns, test a small area before nightly use.

• Suitable for most color-treated hair when applied to lengths and ends.
• Light finish supports styling and heat tools the following day.
• Patch test recommended for very reactive scalps or recent chemical services.

Who is this for: KÉRASTASE Chronologiste Overnight Youth Serum travel size is intended for anyone noticing hair that feels weaker, duller or more frizzy with age who wants a convenient, luxury leave-in nightly treatment. It’s well suited to travelers, testers, and those looking to introduce KÉRASTASE anti-aging hair care into their routine without committing to a full-size bottle. Use it if you want a lightweight overnight product that smooths, adds shine and helps make hair easier to manage by morning.

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