The Nioxin Scalp Treatment 6 for medium Thick Natural Coloured Hair is an ingenious treatment, designed to improve the thickness of your hair. This scalp treatment helps to care for & protect your hair & scalp, leaving both clean & cleansed. Formulated with hard working antioxidants & botanicals to refresh the scalp environment this Nioxin Scalp Treatment 6 for Medium Thick Natural Coloured Hair is the third step in this advanced system to restore thickness to hair. Directions of use: Apply directly to entire scalp. Gently massage into scalp. Do not rinse.