Nioxin System 4 Scalp + Hair Conditioner Scalp Therapy Nioxin System 4 Scalp + Hair Conditioner (Scalp Therapy) is a lightweight professional treatment designed for color-treated, dry, or damaged hair with progressed thinning. It balances moisture, strengthens hair resilience, and reduces breakage to leave hair fuller, thicker, and protected. Formulated with BioAmp Technology to amplify hair structure and increase each strand's thickness and fullness. Authentic New/Sealed Size 300ml/10.1oz Retails for $53