KÉRASTASE Blond Absolu Hyaluronic Acid Hair Serum, 1.7 fl oz — 2% HA for Hydration & Repair of Bleached Blonde

KÉRASTASE Blond Absolu Hyaluronic Acid Hair Serum is a lightweight leave-in treatment that repairs surface damage from bleaching while instantly hydrating hair and soothing the scalp.

Designed for bleached, highlighted and lightened blonde hair, this concentrated serum uses a high-purity 2% hyaluronic acid formula to replenish moisture, smooth fiber roughness and reduce the appearance of breakage. Its dual-action texture absorbs quickly into towel-dried hair and the scalp, delivering shine without weighing fine blondes down. Professionals rely on it as the finishing step in a salon or at-home routine to revive dull, dehydrated strands and create healthier-looking blonde tones.

How does this serum restore bleached and highlighted blonde hair?

The formula targets surface damage created by lightening services, filling in micro-porosities and smoothing the hair cuticle for an immediate improvement in texture and manageability. Results are visible after a single application, with cumulative improvement when used regularly as the last step on damp hair.

• 2% pure hyaluronic acid to attract and lock in moisture across the hair fiber.
• Lightweight, non-greasy finish that increases shine and reduces frizz.
• Designed to be applied from scalp to ends for full-length conditioning.

Will this soothe my dry or irritated scalp after lightening?

The serum includes scalp-soothing properties to alleviate tightness and surface dryness often experienced after bleaching. Massaging it into the scalp helps hydrate and calm the skin while reinforcing the hair’s strength from the roots down.

• Scalp application recommended: 7–13 light doses dispersed with fingertips.
• Formulation focuses on hydration and immediate comfort without heavy residue.
• Complements other Blond Absolu products for balanced scalp and fiber care.

How should I use the serum for best results?

Apply to towel-dried hair as the final step of your hair routine; this ensures the hyaluronic acid seals in moisture without dilution. Use the recommended dose range, distribute evenly with fingers and do not rinse—style as usual for instant shine and lasting hydration.

• Apply 7–13 doses depending on hair length and porosity.
• Massage into scalp, mid-lengths and ends; leave in, do not rinse.
• Works well paired with Blond Absolu shampoo, mask and leave-in treatments.

Is this appropriate for everyday use on color-treated blonde hair?

Yes—the serum is formulated for frequent use as a finishing product on color-treated blondes. Its lightweight nature helps maintain hydration and shine without promoting brassiness; for tone maintenance, combine with Blond Absolu anti-brass products.

• Safe as a regular leave-in to sustain hydration and manageability.
• Does not replace toning shampoos—use alongside violet/anti-brass treatments.
• Preferred by stylists for touch-ups and post-service aftercare.

Who is this for: This serum is aimed at anyone with bleached, highlighted or heavily lightened blonde hair seeking immediate hydration, surface repair and scalp comfort. It is suitable for fine to thick blondes who want salon-level finish and shine without heavy oils, and for clients following a professional blonde-maintenance regimen.

Ingredients

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