8H Night Serum | Dry Hair | Overnight Repair | Kérastase

Hydrate Hair

8H Magic Night Serum: Overnight Nourishing Hair Treatment
Nutritive

8H Magic Night Serum by Kérastase is a beauty sleep high nutrition serum for dry hair. This overnight hair treatment contains anti-dryness polymers for immediate care with a light and non-greasy finish. It also delivers a dose of essential nutrients that boost the formula’s ability to nourish and reinforce the hair. The magical overnight hair serum works for 8 hours to revitalize and regenerate dry hair and protects from pillow friction. +98% stronger hair* Bottle made of 20% recycled glass. *Instrumental test results after application of 8H Magic Night Serum 

90ml

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STEP 1
Spread a pump in your hands and distribute this overnight hair treatment to the lengths and ends of your dry or damp hair.

STEP 2
No need to rinse in the morning

In case of contact with eyes, rinse them immediately and thoroughly. If irritation occurs reduce the frequency of use.

Apply 8H Magic Night Serum before bedtime.

-Protects from pillow friction
-Restores fiber hydration with deep 8-hour action
-Restores radiant, youthful fiber by morning
-Helps restore natural hydration level

+98% of stronger hair*
-84% less frizz instantly*
+48% more softness*
+40% more radiant hair*

*Instrumental test, after application of 8hrs Magic Night Serum.

Key Ingredients

Plant-Based Proteins : In this protein shampoo, wheat, corn, and soy whole grains act as a dietary supplement. Blended with fatty acids, omega, and vitamins, they feed the hair with essential nutrients.

Niacinamide: A derivative of vitamin B3 that locks-in nutrition, making this niacinamide shampoo able to strengthen the fiber barrier for long-lasting health.

Glycerin: From vegetal origin, glycerin boosts the global hydrating performance of the formula.

Full ingredients list

AQUA / WATER ●DIMETHICONE ●C13-16 ISOALKANE ●NIACINAMIDE ●GLYCERIN ●POLYACRYLAMIDE ●PHENOXYETHANOL ●C13-14 ISOALKANE ●LAURETH-7 ●PANTHENOL ●ASCORBYL GLUCOSIDE ●BUTYLENE GLYCOL ●LINALOOL ●HYDROXYCITRONELLAL ●BENZYL SALICYLATE●BENZYL ALCOHOL ●HEXYL CINNAMAL ●CITRONELLOL ●HYDROLYZED WHEAT PROTEIN ●ALPHA-ISOMETHYL IONONE●COUMARIN ●HYDROLYZED CORN PROTEIN ●HYDROLYZED SOY PROTEIN ●LIMONENE ●IRIS FLORENTINA ROOT EXTRACT ●CITRIC ACID ●CI 19140 / YELLOW 5 ●CI 14700 / RED 4 ●PARFUM / FRAGRANCE●

Ingredient Nutritive
“

The hair contains an external protective envelope called the cuticle, that can be weakened. By nourishing the hair with essential materials, Nutritive restores this protective barrier, creating softness, shine and ease of detangling.

”

- Edine Ahbich, Kérastase Scientific Director

Ratings & Reviews

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  • 5★3100
  • 4★295
  • 3★92
  • 2★35
  • 1★48

Average Customer Ratings

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USA

User Type: Consumer

Age: 35 to 44

Gender: Female

- 4/30/2026

the best

The best overnight serum: wake up with frizz-free hair- Originally posted on kerastaseusa.com

Yes, I recommend this product

#Product Supplied Free

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USA

User Type: Consumer

Age: 45 to 54

Gender: Female

- 4/30/2026

Awsome

I love it! I used to have to blow-dry my hair because there was no other way to make it look decent. Now I just let it air-dry apply this serum and I'm done! My hair is incredibly soft.- Originally posted on kerastaseusa.com

Yes, I recommend this product

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USA

User Type: Consumer

Age: 18 to 24

Gender: Female

- 4/30/2026

Magic in a bottle

This serum leaves my hair feeling silky soft and smooth. A little bit goes a long way. I apply it to my nightly self care routine.- Originally posted on kerastaseusa.com

Yes, I recommend this product

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USA

User Type: Consumer

Age: 35 to 44

Gender: Female

- 4/29/2026

Been using this for a month now and its great!!!

I like to put it in when my hair is damp and then I braid my hair before I go to bed. I'll take my braid out in the morning and my hair smells amazing and feels great.- Originally posted on kerastaseusa.com

Yes, I recommend this product

#Product Supplied Free

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USA

User Type: Consumer

Age: 35 to 44

Gender: Female

- 4/29/2026

Excellent

I've been using the Kérastase Potentialiste serum for a few weeks now and I'm genuinely impressed. This is more of a scalp-focused treatment rather than a traditional hair serum and you can really feel the difference.It has a very lightweight almost watery texture that absorbs instantly without leaving any residue or greasiness. My scalp feels more balanced less irritated and overall healthier. I also noticed my hair looks shinier at the roots and feels softer over time.What I love most is that it doesn't weigh the hair down at all so I can use it daily—even on clean hair—without affecting volume.If you're dealing with dryness sensitivity or just want to upgrade your scalp care routine this is 100% worth trying.- Originally posted on kerastaseusa.com

Yes, I recommend this product

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FAQ

Does 8H Magic Night Serum actually work for dry hair?
Yes, 8H Magic Night Serum deeply nourishes dry hair overnight. This overnight serum works during your sleep to restore hair moisture levels, leaving dry lengths soft and easy to style by morning.

How long before I see results with 8H Magic Night Serum?
You will see visible results after just one night. 8H Magic Night Serum provides up to 8 hours of continuous nourishment, so you wake up with instantly softer, hydrated hair

Can I use 8H Magic Night Serum on fine hair?
Yes, 8H Magic Night Serum is perfectly safe and effective for fine hair. This lightweight overnight serum absorbs quickly without leaving any greasy residue or weighing down fine strands

What is the difference between 8H Magic Night Serum and Elixir Ultime Oil?
The main difference is that 8H Magic Night Serum is an overnight treatment designed to deeply hydrate dry hair while you sleep, whereas Elixir Ultime Oil is a daily styling oil used to boost shine and protect hair from heat up to 230°C

Is 8H Magic Night Serum a leave-in or rinse-out?
8H Magic Night Serum is a leave-in treatment. Apply 1 to 2 pumps of this serum to dry or damp lengths before bedtime, and do not rinse the product out in the morning.

Nutritive Routine

Nutritive offers the most care for all types of dry hair, from scalp to ends – including classic bains, masques and primers, plus new leave-in serums for easy access to nourishing actives around the clock.

My hair is

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