Nioxin Hair Fall Defense Duo is designed to reduce visible hair fall and promote stronger, healthier-looking hair from the root. When used together, the system removes scalp build-up and helps grow stronger hair, delivering better results and visibly less hair fall in just 12 weeks. The Hair Fall Defense Serum is a leave-on daily scalp treatment for thinning hair, infused with niacinamide, biotin, caffeine, and Sandalore to support hair anchorage and thickness. Clinically proven to increase hair anchorage with visible results in as little as 8 weeks, it helps thicken hair from the very first use and is gentle enough for daily application.