System 2 Shampoo is designed for natural, untreated hair with progressed thinning. Clinically and dermatologically tested, the shampoo nourishes and gently cleanses your hair to prevent against follicle-clogging sebum, resulting in thicker, fuller hair. Formulated with a powerful blend of niacinamide, biotin and caffeine to help nourish the hair root, stimulate hair follicles and strengthen the hair. THICKENS HAIR: clinically designed to add thickness and fullness to natural hair with progressed thinning, with visible results in just 30 days. SUPPORTS SCALP HEALTH: advanced formula gently cleanses the scalp, removing impurities and excess sebum that can clog hair follicles, creating a healthier environment for the scalp. REDUCES HAIR THINNING: helps minimize hair breakage, promoting the appearance of fuller, thicker hair. NOURISHES THE SCALP: infused with nourishing ingredients, antioxidants, and UV protecting ingredients, the kit includes Nioxin Leave-In Treatment which can nourish and revitalize the scalp, improving its overall health and condition.