Targeting biological scalp and hair ageing, the Kérastase Chronologiste Longevity Scalp Serum helps to combat a loss of density and vitality. The scalp serum is powered by 3% pro-xylane, a patented, sugar-derived anti-aging molecule, and ochrophyta algae to deliver intensive scalp care for hair that feels hydrated, fuller and shinier. Scented with the signature Chronologiste fragrance, the lightweight formula absorbs effortless without residue or greasiness.