NIOXIN System 1 Scalp Therapy Conditioner, Gallon (128 oz) Nioxin System 1 Scalp Therapy Conditioner is created for fine or normal hair, and increases texture while protecting against damage, refreshing the scalp, and adding shine. Scalp therapy fights scalp-related problems, including seborrheic dandruff, while providing mositure to the scalp. How to use: Apply from scalp to ends. Leave on for 1-3 minutes. Rinse. Follow with Nioxin Scalp Treatment.