Product Overview Formulated for natural hair with light thinning, the Nioxin System 1 Scalp Treatment 100ml refreshes your scalp and gives hair a healthy shine. Containing Transactiv Delivery System 2.0, this leave-in treatment helps hair appear thicker with amplified volume. The fullness of each hair strand is increased and protected against breakage with this final step in a three-step regime. Directions for Use Shake well before use. Apply evenly across scalp and leave-in.