KERASTASE Première Sérum Filler Fondamental Anti-Frizz Repair Serum 90ml

KERASTASE Première Sérum Filler Fondamental Anti-Frizz Repair Serum 90ml is a lightweight leave-in repairing, anti-breakage and anti-frizz serum for damaged, porous and over-processed hair. Formulated with Peptides and Glycine, it helps fill and seal damaged hair fibres, strengthen weakened hair and protect against humidity and heat up to 230°C, leaving hair smoother, softer and glossier.

KERASTASE reports 3x smoother, 2x softer and 99% stronger hair, plus 72-hour anti-frizz protection, based on instrumental testing.

Repairs porous, damaged hair – Helps reinforce the internal structure of weakened hair while sealing the cuticle.

72-hour anti-frizz protection – Helps lock out frizz and repel humidity for longer-lasting smoothness.

Heat protection up to 230°C – Ideal before blow-drying, straightening or other heat styling.

Strengthens against breakage – Helps reinforce hair compromised by bleaching, colouring and repeated chemical or heat treatments.

Smooths and softens – Helps rough, porous hair become more supple and manageable.

Protects against calcium buildup – Helps shield porous hair from the damaging effects associated with excess calcium from hard water.

Lightweight leave-in formula – Provides repair and protection without requiring rinsing.

90ml · Repair Serum · Anti-Frizz · Anti-Breakage · Heat Protection · Damaged Hair · Peptides · Glycine

Best for: Damaged hair • Porous hair • Bleached hair • Highlighted hair • Over-processed hair • Hair prone to breakage • Frizzy damaged hair • Heat-styled hair

What Is It?

KERASTASE Première Sérum Filler Fondamental Anti-Frizz Repair Serum 90ml is the leave-in repair and protection step from the KERASTASE Première collection.

KERASTASE explains that damaged, porous hair can absorb three times more calcium from water than untreated hair. This excess calcium can contribute to stiffness, roughness and breakage.

Sérum Filler Fondamental uses a dual-action approach. Its lightweight texture helps fill the fibre to reinforce strength while sealing the cuticle to neutralise porosity. This also creates protection against humidity, calcium buildup and styling heat.

Unlike the Première rinse-off treatments, this is a leave-in finishing serum, making it particularly useful before blow-drying.

The result:

Repair → Fill → Strengthen → Seal → Control Frizz → Protect

Why You'll Love It

• Leave-in repair serum for damaged hair
• Ideal for porous and over-processed hair
• Helps protect against breakage
• Provides 72-hour anti-frizz protection*
• Protects against heat up to 230°C*
• Helps repel humidity
• Helps shield hair against calcium buildup
• Makes hair 3x smoother*
• Makes hair 2x softer*
• Helps leave hair 99% stronger*
• Lightweight, non-rinse formula
• Contains Peptides and Glycine

*Instrumental tests.

Who Is It For?

Ideal for:

Damaged hair
Porous hair
Bleached hair
Highlighted and balayage hair
Colour-treated hair
Over-processed hair
Hair prone to breakage
Frizzy damaged hair
Rough or stiff-feeling hair
Hair frequently exposed to heat styling

Pair Me With

KERASTASE Première Concentré Décalcifiant Ultra-Réparateur – Start with the intensive pre-shampoo treatment designed to help remove excess calcium and repair damaged hair.

KERASTASE Première Bain Décalcifiant Réparateur Shampoo – Follow with the repairing, decalcifying cleansing step for damaged hair.

KERASTASE Première Fondant Fluidité Réparateur Conditioner – Ideal for fine-to-medium damaged hair that needs softness, moisture and strength.

KERASTASE Première Masque Filler Réparateur – Choose this richer treatment when damaged hair needs more intensive repair, moisture and anti-breakage care.

KERASTASE Première Huile Gloss Réparatrice Hair Oil – Finish with the repairing oil to help seal the appearance of split ends and enhance shine.

Concentré Décalcifiant Ultra-Réparateur Pre-Shampoo | Kérastase

Step 1: Apply generously on damp hair before shampoo and massage throughout. Leave on for 5 minutes.
Step 2: Don’t rinse and layer Première Bain Décalcifiant Réparateur Repairing Shampoo directly to maximize efficacy.
Step 3: Massage and emulsify. Rinse and follow with Première Fondant or Mask.

Aqua / Water / Eau, Isopropyl Myristate, Dimethicone, Triethanolamine, Amodimethicone, Parfum / Fragrance, Phenoxyethanol, Carbomer, Polyquaternium-4, Potato Starch Modified, Limonene, Hydroxypropyl Guar, Behentrimonium Chloride, Hydrolyzed Vegetable Protein PG-Propyl Silanetriol, Glycine, Trideceth-6, Isopropyl Alcohol, Linalool, Cetrimonium Chloride, Citral, Coumarin, Benzyl Salicylate, Sodium Benzoate, Benzyl Alcohol, Citronellol, Alpha-Isomethyl Ionone, Potassium Sorbate, Geraniol.

Always check your current EU/Cyprus packaging as the final INCI reference in case of formulation updates.