2% Pure Hyaluronic Acid Scalp & Hair Serum

by Kérastase Blond Absolu

Available in Canada at Decd

For

Bleached, highlighted, lightened or blonde hair that feels dry, sensitized, brittle or depleted after a lightening service. Ideal for anyone seeking lightweight scalp hydration, improved hair strength and a softer, plumper finish.

Description

Kérastase Blond Absolu 2% Pure Hyaluronic Acid Scalp & Hair Serum is a lightweight, dual-action leave-in treatment created to hydrate and repair bleached blonde hair while comforting the scalp.

Inspired by hydrating skincare, its translucent gel texture contains Kérastase’s highest concentration of macro- and micro-molecular hyaluronic acid. The formula helps replenish moisture, repair visible surface damage and leave sensitized blonde hair feeling stronger, smoother and more substantial.

Applied after washing, the fast-absorbing serum hydrates both the scalp and hair without leaving a greasy or heavy residue. Blonde lengths feel softer, plumper and more resilient, while the scalp feels moisturized and comfortable.

Who It’s For

Ideal for:

• Bleached or lightened blonde hair

• Highlighted or balayage hair

• Dry or sensitized blonde hair

• Brittle hair prone to breakage

• Hair that feels rough or depleted after lightening

• Dry or uncomfortable scalps

• Fine, medium or thick hair textures

• Anyone seeking lightweight hydration without oiliness

What It Does

• Instantly hydrates the scalp and hair

• Helps repair visible surface damage after one use

• Strengthens sensitized blonde hair

• Helps protect against dryness-related breakage

• Supports and preserves the scalp’s moisture barrier

• Comforts a dry or sensitized scalp

• Plumps and smooths the hair fibre

• Improves softness, resilience and shine

• Absorbs quickly without a greasy finish

• Prepares hair for blow-drying or air-drying

Proven Results

• Repairs visible surface damage after one use

• Up to 96% stronger blonde hair when used with Bain Lumière and Cicaflash

• Provides up to three days of hydration when used within the recommended routine

• Instantly hydrates the scalp and hair

• Helps preserve the scalp’s protective moisture barrier

Results are based on instrumental or clinical testing. Results may relate to the serum alone or its use with the recommended Blond Absolu routine.

When to Use

Use after shampooing and conditioning whenever bleached or highlighted hair and scalp need concentrated hydration and repair.

It is particularly beneficial immediately following a lightening service or during periods when blonde hair feels dry, fragile or depleted.

Apply to towel-dried hair before blow-drying or air-drying.

How to Use

Apply to towel-dried hair.

Dispense approximately seven pumps directly onto the scalp.

Apply seven to thirteen additional pumps through the mid-lengths and ends, adjusting the amount according to hair length, thickness and dryness.

Massage gently into the scalp and distribute through the hair.

Do not rinse.

Follow with Kérastase Blond Absolu Huile Cicaextreme through the ends if additional nourishment and sealing are desired.

Proceed with blow-drying or allow the hair to air-dry.

Avoid the eye area. In case of contact with the eyes, rinse immediately and thoroughly.

Formula

A lightweight, water-based gel serum formulated with macro- and micro-molecular hyaluronic acid, moisturizing humectants and scalp-comforting ingredients.

Glycerin and sodium hyaluronate attract and retain moisture, helping replenish hydration in both the scalp and sensitized hair fibre.

Hydroxyethylpiperazine ethane sulfonic acid helps support the formula’s optimal pH and complements its surface-refining performance. PEG-40 hydrogenated castor oil helps solubilize and evenly distribute the fragrance and formula through the hair.

The short, focused ingredient list creates a transparent serum that absorbs quickly and provides intensive hydration without silicones, heavy oils or a greasy residue.

Key Ingredients

2% Pure Hyaluronic Acid Complex
A concentrated combination of macro- and micro-molecular hyaluronic acid designed to hydrate the scalp and hair. It helps plump sensitized fibres, smooth the surface and improve the strength and resilience of blonde hair.

Sodium Hyaluronate
A form of hyaluronic acid that attracts and retains moisture, supporting a softer, smoother and more hydrated feel.

Glycerin
A moisture-binding humectant that helps replenish hydration and protect the hair and scalp from feeling dry or depleted.

Hydroxyethylpiperazine Ethane Sulfonic Acid
A buffering ingredient that helps maintain the formula’s optimal pH and supports a refined, smooth hair surface.

Fragrance

Features the signature Kérastase Blond Absolu fragrance—a fresh, clean and luxurious composition inspired by modern colognes.

Top Notes: Orange blossom, bergamot and mandarin
Heart Notes: Peony, fig and laurel
Base Notes: Cedarwood, musk and cardamom

The fragrance is luminous, aromatic and softly sensual, bringing an uplifting finish to the blonde-hair ritual.

Why You’ll Love It

Blonde hair often needs hydration just as much as it needs repair. This concentrated serum provides both while remaining remarkably light.

Its clear gel texture absorbs quickly into the scalp and lengths, leaving no oily film or heavy residue. Hair feels softer, fuller and more resilient, while the scalp feels hydrated and comfortable.

It is especially beautiful following a lightening appointment, when the hair and scalp may feel most vulnerable and moisture-depleted.

Product Details

• Product type: Hydrating and repairing scalp and hair serum

• Collection: Kérastase Blond Absolu

• Hair concern: Dryness, damage, brittleness and scalp discomfort

• Hair types: Bleached, lightened, highlighted and blonde hair

• Texture: Transparent lightweight gel

• Finish: Soft, smooth, plumped and radiant

• Leave-in formula

• No rinsing required

• Non-greasy finish

• Contains 2% pure hyaluronic acid complex

• Suitable for towel-dried hair

• Size: 50 mL

Full Ingredient List

Aqua / Water / Eau, Glycerin, Sodium Hyaluronate, Hydroxyethylpiperazine Ethane Sulfonic Acid, Phenoxyethanol, Citric Acid, PEG-40 Hydrogenated Castor Oil, Chlorphenesin, Tetrasodium Glutamate Diacetate, Limonene, Parfum / Fragrance.

Ingredient lists may be updated. Please refer to the product packaging for the most current ingredient information.