Refresh the scalp and increase hair volume with Nioxin's three part System 1 Scalp & Hair Treatment for Natural Hair with Light Thinning. This professional leave-in refreshes the scalp and gives a healthy shine to natural hair. Thanks to its Transactive Delivery System 2.0 technology, the volumizing Nioxin leave-on treatment helps provide thicker-looking hair by increasing the fullness of each hair strand. Nioxin's diameter-increasing Scalp Treatment is the final step of the three part System, which amplifies hair texture while protecting against breakage.See which Nioxin 3-Part System is best for you. Packaging May Vary.