What is it: System 3 Leave On Treatment is designed for dry, damaged, colour-treated hair with light thinning. Clinically and dermatologically tested, this nourishing and protective leave on treatment strengthens each strand from within, resulting in thicker, fuller hair. Why you'll love it: This treatment helps balance the scalp, creating a healthy environment for hair growth. In addition to its strengthening and nourishing properties, it adds moisture and shine to your hair. Featured ingredients: Formulated with a powerful blend of niacinamide, wild mint oil and caffeine to help nourish the hair root, stimulate hair follicles and strengthen the hair. Key benefits: THICKENS THE HAIR: clinically designed to add thickness and fullness to dry, damaged, colour-treated hair with light thinning, with visible results in just 30 days. SUPPORTS SCALP HEALTH: advanced formula gently cleanses the scalp, removing impurities and excess sebum that can clog hair follicles, creating a healthier environment for the scalp. REDUCES HAIR THINNING: helps minimize hair breakage, promoting the appearance of fuller, thicker hair while protecting the colour. NOURISHES THE SCALP: infused with nourishing ingredients and antioxidants, the Scalp + Hair Thickening Treatment can nourish and revitalize the scalp, improving its overall health and condition. How to use: Shake Nioxin Leave-In Treatment well and apply directly to the entire scalp, focusing on areas of irritation or discomfort. Gently massage and comb through. Do not rinse. For best results, use in conjunction with Nioxin System 3 Shampoo and Conditioner.