Kérastase 8H Magic Night Serum is an overnight leave-in treatment that deeply hydrates, softens, and detangles hair for smoother, more manageable hair by morning.
Overnight High-Nutrition Hair Serum
The 8H Magic Night Serum by Kérastase is a lightweight, non-greasy hair serum designed to replenish dry hair while you sleep. Formulated with anti-dryness polymers and essential plant-based nutrients, this overnight hair treatment penetrates the hair fiber to restore moisture, reinforce hair strength, and protect against pillow friction.
Proven Results
- 94% felt their hair was shinier and silkier.*
- 94% noticed reduced frizz.*
*Based on a consumer test of 70 subjects after overnight use. Bottle made from 20% recycled glass.
Key Benefits
- Deep Hydration: Restores moisture levels with an 8-hour continuous release.
- Friction Protection: Shields hair fibers against nighttime pillow friction to prevent breakage and frizz.
- Overnight Transformation: Leaves hair noticeably softer, smoother, and radiant by morning.
- Lightweight Finish: Non-greasy formula absorbs quickly without leaving residue or weighing down hair.
How to Use
- Application: Before bedtime, dispense 2 to 4 pumps into hands (adjust based on hair length and thickness).
- Distribution: Work evenly through the lengths and ends of dry or damp hair.
- Leave In: Do not rinse out in the morning. Style as usual.
Note: In case of contact with eyes, rinse immediately and thoroughly. If irritation occurs, reduce frequency of use.
The Science of Hair Dryness
Hair dryness occurs when the hair fiber loses essential proteins and lipids, causing damaged cuticles. Kérastase targets nutrient deficiency across three distinct stages:
- Scalp Stage: Depleted essential proteins, fatty acids, and vitamins.
- Lengths Stage: Low nutrient levels leading to a weakened natural protective barrier.
- Ends Stage: Severe nutrient depletion resulting in split, chapped cuticles.

