Concentré Décalcifiant Ultra-Réparateur

A dual-action decalcifying and repairing pre-shampoo hair treatment for damaged hair. Removes calcium and reinforces hair strength, leaving it stronger, smoother, and shinier.

15ml / 45ml / 250ml / 1000ml


Product Description

The first pre-shampoo treatment that removes calcium and fully repairs all types of damaged hair.
Hard water with calcium can further damage already delicate over-processed or bleached hair. Because it’s more porous, damaged hair absorbs 3 times more calcium than natural hair. This treatment’s concentration of pure acids has a dual action: it decalcifies hair from this calcium overdose, and repairs it from the inside out, restoring hair strength, and reversing its stiff, dull appearance.

With its transparent gel texture, this brilliant hair savior dramatically repairs persistent damage, reconnecting broken keratin links to reinforce hair strength and structure. Hair is left stronger, healthier-looking, and shinier – as if renewed. Leave on Kérastase Concentré Décalcifiant Ultra-Réparateur without rinsing, and layer with Kérastase Première Bain Décalcifiant Réparateur for extra decalcifying and repairing action. Team with Fondant Fluidité Réparateur as a final step.

Bottle made of 95% recycled plastic*
Recreates 99% of hair's original strength**

*Excluding colorants and additives
**Instrumental test after 6 applications of Première Concentré + Bain + Fondant/Masque


Key Words:

Repairing – Strengthening – Remove Calcium – Damaged Hair



Damaged Hair
Prevent Breakage




Stronger Hair




Luxurious Care
Hair Treatment


Product Benefits

✔ Decalcifies* and dramatically repairs persistent damage.
✔ Reverses stiffness and dullness
✔ Reconnects broken links between keratin chains* for an inner structure reinforcement

Recreates 99% of hair's original strength*
+97% inner structure reinforcement*
93% less breakage**
75% more shine**

*Instrumental test after 6 applications of Première Concentré + Bain + Fondant/Masque
**Instrumental test

Apply generously on wet lengths before shampoo and massage throughout. 

Leave on for 5 minutes. Don’t rinse. 

Layer Première Bain* directly on top to maximize efficacy. 

Rinse and follow with Première Fondant or Mask.*

*Maximize your results with the power of layering 

Key Ingredients

Citric acid: 
An organic acid that acts from core to surface to deeply eliminate calcium overdose, neutralising dullness and stiffness.

Once calcium is removed, this amino acid penetrates hair's inner layer to deeply repair. 

Full Ingredients List

Aqua / Water / Eau • Glycerin • Propylene Glycol • Glycine • Citric Acid • Sodium Hydroxide • Parfum / Fragrance • Cetrimonium Chloride • Peg-40 Hydrogenated Castor Oil • Polysorbate 20 • Polysorbate 80 • Phenoxyethanol • Hydrolyzed Vegetable Protein Pg-propyl Silanetriol • Quaternium-80 • Limonene • Hydroxypropyl Guar • Hydroxypropyl Guar Hydroxypropyltrimonium Chloride • Linalool • Sodium Benzoate • Citral • Potassium Sorbate

How To Dramatically Reverse Persistent Damage?

Kerastase discovered the reason behind damage that keeps coming back: CALCIUM!

3X more calcium is absorbed with damaged hair as it is more porous (vs healthy hair), leading to a calcium overdose 

PERSISTENT damage happens when calcium sneaks in-between keratin chains at every contact with water, breaking their links, making hair rigid, stiff and easy to break

BUILD-UP of calcium on the outside makes hair rough and dull

Pure Acids Concentration

Free hair from calcium overdose with citric acid, an organic acid that acts from core to surface, to neutralise dullness and stiffness. Once calcium is removed Glycine, an amino acid, penetrates hair's inner layer to deeply repair. As a results broken links between keratin chains are reconnected, dramatically reducing breakage.

Première Signature Scent

PORTOFINO SUMMER: this luminous creation reveals the sensuality of a vibrant mandarin. The Fragrance unveils a citrus & mandarin cocktail surrounded by an accord of orange flower and jasmine. It creates a true summer nectar sending you directly to Italy.


What is Concentré Décalcifiant Ultra-Réparateur ?

Why is Concentré Décalcifiant Ultra-Réparateur used before the shampoo?

What is the leave-in time?

What is the quantity that is recommended to be used?

Can Concentré Décalcifiant Ultra-Réparateur be used/applied alone?


Ask your Hairdresser : Salon Ritual

Far more than the place to get your root touch-up or an occasional trim, book an appointment at your nearest Kérastase salon for a complimentary personalized hair diagnosis.

Discover all in-salon experiences

Damaged Hair: The Hidden Perils of Hard Water

Water - and more specifically the calcium within - can cause damage to your hair. The secret to defending your hair fibers? Decalcification.


Unlock the Secret to Luxurious Hair: The Art of Layering Haircare Products

It’s no longer enough to wash, condition and go. Want your best hair ever? It’s time to learn to layer (trust us, it’s a game-changer).


Luxury Haircare for Healthy Hair: The Ultimate Routines to Rescue Damaged Hair

Our hair is often described as our crowning glory, and there's a good reason for that.



Your Personal Care

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