Nioxin System 2 Hair Thickening Treatment Serum is specifically formulated for individuals with untreated, visibly thinning hair. This treatment utilizes a power blend of ingredients including Niacinamide, Biotin, and Caffeine to revitalize the scalp environment and address the appearance of thinning. It works to provide a denser-looking hair profile by optimizing the scalp condition for healthier hair growth. Regular use promotes visibly fuller and stronger hair strands from the root.