Kerastase Fusio-Dose Concentre H.A Ultra-Violet (For Lightened, Highlighted Cool Blonde Hair) 10x12ml/0.4oz

The Fusio-Dose Concentré H.A Ultra-Violet delivers precise hydration and cool-tone refinement in individually measured 12ml vials engineered for lightened, highlighted hair.

This concentrated formula combines high-molecular-weight hyaluronic acid with UVA and UVB protective filters to reinforce water loss in chemically processed strands. The inclusion of violet-pigment complexes allows the serum to neutralize underlying yellow warmth typical of lifted blonde shades, maintaining cooler ash and pearl reflections without leaving heavy residue on fine textures. Unlike standard leave-in conditioners that spread active ingredients across large surface areas, the ampoule format keeps concentrations stable until opened, ensuring full efficacy from the first drop to the last.

Dissolve the concentrate on damp hair immediately after cleansing. The lightweight aqueous base spreads through porous, lightened sections quickly, allowing you to distribute the product evenly before styling. Each of the ten vials supplies one complete treatment cycle, supporting consistent color preservation during peak UV exposure months or extended periods between professional gloss appointments.

Choose this concentrate when existing routines fail to hold moisture on bleached lengths or when heat and sunlight repeatedly strip cool tones from highlighted hair. The measured packaging eliminates guesswork, delivering a controlled amount of hydration and color protection with every application.