Experience the rejuvenating effects of Kérastase Première Sérum Filler Fondamental, a weightless leave-in treatment crafted to repair and enhance the inner vitality of all hair types, leaving it lustrous and flexible.

Due to its heightened porosity, processed hair absorbs three times more calcium from water than untreated hair, leading to a detrimental calcium overload visible both inside and outside the hair fiber. Kérastase Sérum Filler Fondamental offers a dual-action solution: its lightweight, balm-like texture seals the cuticles to protect the hair's surface while replenishing the fiber and fortifying hair strength. Your hair is shielded from the damaging effects of calcium found in hard water, as well as from humidity and heat up to 230°C. Say goodbye to frizz as your hair is left smooth, supple, and effortlessly manageable.

For comprehensive care tailored to your lightened or damaged hair, complement your routine with the rest of the Première range. Embrace the potency of the layering technique: Begin with the pre-shampoo treatment, Kérastase Concentré Décalcifiant Ultra-Réparateur, and without rinsing, follow up with Kérastase Bain Décalcifiant Réparateur. Continue with the conditioner or mask before applying Kérastase Sérum Filler Fondamental as the final step in your reparative journey.

Experience up to 72 hours of anti-frizz protection, as confirmed by instrumental testing.