The Nioxin Scalp Treatment 6 for medium Thick Natural Coloured Hair is a fantastic treatment designed to improve your hair's thickness & density. This treatment is also designed to cleanse your hair & scalp, leaving both fresh & protected. 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.