KérastaseNutritive 8H Magic Night Serum

What it is: Hair serum, 90 ml. Night serum. Nourishing leave-in serum hydrates, adds deep nutrition, moisturizes, and detangles to leave hair soft and shiny by morning. Protects from pillow friction, reduces frizz and hydrates hair in just eight hours as you sleep.

What Else You Need to Know:

• Benefits: Formulated with Plant-Based Proteins to nourish hair with essential nutrients while retaining moisture and Niacinamide to lock in hydration for long-lasting hair strength.
• Additional benefits: Intensely nourishes and detangles hair, protecting from pillow friction. Strengthens, hydrates, and enhances shine. Absorbs overnight without transferring onto pillow
• Suggested use: Before sleep, apply one to two pumps, then massage into lengths and ends of dry or damp hair. Leave in overnight. No need to rinse in the morning. Repeat three nights a week.

From the Amazon listing.