KOSE COSME DECORTE AQ Boosting Treatment Hair Serum Refill 200ml The “pre-serum” for your hair — a breakthrough born from dermatological science. This water-based hair serum deeply penetrates and repairs from within, leaving hair smooth and manageable to the ends. Used before conditioner or treatment, it infuses damaged hair with luxurious moisture, repairing dryness and damage caused by coloring or friction for a soft, silky finish. This is a refill product. Pump not included. [How to Use] Use 2–3 times a week. After shampooing, lightly towel-dry hair and apply 1–2 pumps directly to damaged areas (about 4 pumps for medium-length hair). Add more if needed. Leave on for about 10 seconds, then apply your regular conditioner or treatment directly over it without rinsing. Rinse thoroughly afterward. (If using alone, rinse after applying this serum.)