Redken Acidic Grow Full System Density & Strength Scalp & Hair Serum 100ml is a professional lightweight treatment designed to target thin or flat hair. Ideal for salon use and client aftercare, this pH-balanced formula helps create visibly thicker, fuller-looking hair while supporting scalp health and hydration. Powered by AZELAIC ACID + 5% Hydrating Complex, this advanced scalp and hair serum delivers: Fuller-looking and thicker-looking hair A rebalanced, hydrated scalp How To Use: After rinsing conditioner, apply to damp hair Spray directly onto the roots Massage into the scalp using your fingertips Do not rinse Style as usual Perfect for professional hairdressers and stylists, this lightweight serum enhances manageability, supports scalp balance and delivers visibly thicker, revitalised hair with continued use.