Nioxin Night Density Rescue Serum is a leave-in hair treatment formulated to support optimal hair growth and promote stronger hair strands while you sleep. This specialized serum integrates key ingredients like Ginger and Caffeine to revitalize the scalp environment overnight. Regular use helps in creating a better foundation for healthy hair. Apply this leave-in serum as part of your nightly routine to maximize its restorative effects, ensuring you wake up to hair that feels denser and more resilient.