Nioxin Scalp + Hair Thickening System 1 Leave on Treatment is designed for natural hair with light thinning. This professional leave-in treatment refreshes the scalp and enhances hair volume, providing a healthy shine. Utilizing Transactive Delivery System 2.0 technology, it helps achieve thicker-looking hair by increasing the fullness of each strand. The treatment nourishes the scalp with botanicals and antioxidants, promoting overall scalp health and reducing hair thinning by strengthening hair resilience.