Kerastase Blond Absolu 2% Hyaluronic Acid Serum is a lightweight, leave-in gel for blonde, bleached, or highlighted hair. It helps hydrate dry strands and scalp, supports softness and flexibility, and reduces signs of dryness. The non-greasy formula has a fresh citrus-floral scent. Apply 3–13 pumps to towel-dried hair and 7 pumps to the scalp. Do not rinse. For best results, use with Blond Absolu shampoo and conditioner.