Nioxin Scalp & Hair Leave-In Treatment System 4 is a professional thickening treatment designed for color-treated hair with noticeable thinning. This leave-in formula helps provide thicker-looking hair by increasing the fullness of each strand. Key Benefits: Moisturizes hair and scalp Increases hair resilience and moisture balance Amplifies hair texture while protecting against breakage Provides UV protection for scalp and hair This volumizing leave-on treatment is the final step of the Nioxin System 4 regimen. It's formulated to refresh the scalp and increase hair volume, leaving your hair looking fuller and thicker. The treatment contains nourishing botanicals, antioxidants, and UV protecting ingredients to help revitalize the scalp and improve its overall condition. Ingredients Key ingredients include Niacinamide, Caffeine, Mentha Arvensis Leaf Oil, Peppermint Oil, and antioxidants. For a full list of ingredients, please refer to the product packaging. Suggested Use Shake well before use Apply directly to the entire scalp Gently massage into the scalp Do not rinse Use daily for best results Note: May cause temporary redness to scalp after application. This is normal and should subside quickly.