Nioxin System 1 is a three-step scalp and hair care system for natural, untreated hair with light thinning, sold as a kit containing a cleansing shampoo, a scalp therapy conditioner, and a leave-in scalp and hair treatment. It's part of Nioxin's numbered System line, which the brand groups by hair condition: Systems 1 and 2 for natural/untreated hair (light vs. progressed thinning), and Systems 3 and 4 for color-treated or chemically processed hair.
The three products share an active complex that includes niacinamide, biotin, and caffeine, along with peppermint oil and wild mint oil, which Nioxin markets as supporting scalp circulation and clearing the follicle-clogging buildup that can accompany thinning hair. Nioxin cites its own testing showing that a majority of users saw a thickening effect and increases in density and fullness after consistent use over 30 days.
- 3-step kit: cleansing shampoo, scalp therapy conditioner, leave-in scalp and hair treatment
- Formulated for natural, untreated hair experiencing light thinning
- Built around a niacinamide, biotin, and caffeine active complex
Nioxin currently markets System 1 as a hair-thickening and scalp-health system for natural hair rather than a sensitive-scalp product specifically; the brand's dedicated sensitive/itchy-scalp line is sold separately under the Scalp Relief name.
