Nioxin System 4 Scalp + Hair Shampoo is designed for dry, damaged, or color-treated hair with progressed thinning. This professional shampoo gently cleanses and nourishes the scalp, removing impurities and excess sebum that can clog hair follicles, creating a healthier environment for hair growth. Formulated with biotin, niacinamide, and caffeine, it helps to strengthen brittle strands, nourish the hair root, and stimulate hair follicles, promoting the appearance of thicker, fuller, and healthier-looking hair. It reduces hair thinning by minimizing breakage and strengthening hair resilience. The shampoo contains invigorating ingredients like Mentha Arvensis Leaf Oil and Peppermint Oil to refresh and stimulate the scalp. Experience visible results in just 30 days, with 85% of consumers noticing a thickening effect and 80% noticing an increase in hair density and fullness. Use alongside the complete System 4 collection for optimal results.