Kérastase Première Sérum Filler Fondamental 90ml is an advanced leave-in serum designed to reconstruct, strengthen, and protect damaged hair from within. This lightweight yet highly potent formula works to reverse calcium buildup, which weakens the hair fiber and leads to breakage. Enriched with Citric Acid and Peptides, it penetrates deep into the hair structure, filling in gaps, fortifying strands, and improving elasticity. The serum provides long-lasting hydration, protection against heat damage, and an instant boost of softness and shine. Ideal for chemically treated, bleached, or fragile hair, it ensures stronger, healthier, and more resilient strands over time.

• A powerful repairing leave-in serum that strengthens and protects hair.
• Eliminates calcium buildup to prevent brittleness and breakage.
• Infused with Citric Acid to purify and fortify weakened strands.
• Peptides deeply nourish and reconstruct the hair fiber.
• Provides heat protection, moisture balance, and enhanced elasticity.

• Lightweight leave-in serum for deep repair and protection.
• Eliminates calcium deposits to prevent hair weakening.
• Infused with Citric Acid to detoxify and fortify strands.
• Peptides reconstruct and strengthen the hair fiber.
• Provides heat protection for up to 230°C.
• Enhances hydration, elasticity, and resilience.
• Leaves hair silky, smooth, and more resistant to breakage.

Apply 2–3 pumps to damp or dry hair, focusing on mid-lengths and ends. Do not rinse. Style as desired. For optimal results, use after Kérastase Première Bain Décalcifiant Réparateur and Masque Filler Réparateur for a complete hair repair routine.