Nioxin System 1 for thinning natural, non-colored hair amplifies hair texture and protects hair against breakage. Nioxin System Kit 1 thinning hair treatment is specially formulated as a hair thickening treatment, delivering denser-looking hair. It reduces hair loss due to breakage and strengthens the hair, while refreshing the scalp and delivering a healthy shine to natural, non-colored hair with light thinning.