Advanced Hydrating Formula: This potent leave-in serum features a 5% Hydrating Complex designed to leave thicker-looking hair Total Scalp Rebalancing: Formulated with Azelaic Acid and Prebiotics, this pH-balanced serum directly targets the scalp to restore essential moisture and create a healthy, hydrated foundation Application Routine: For best results, spray directly onto the scalp from half an inch away on clean, damp hair and massage in. Do not rinse. A fast-absorbing, leave-in formula also for daily use Targeted Leave-In: Expertly designed as a daily treatment for those with fine, thin, or thinning hair seeking to strengthen strands and promote an optimal scalp environment for healthy-looking growth Contents: 1 x Redken Acidic Grow Full System Scalp & Hair Serum, Leave-In Treatment for a Rebalanced Scalp & Fuller-Looking Hair, 100ml