Nizoral Anti-Dandruff Shampoo is a powerful formula that controls flaking, scaling and itching. It combines the effectiveness of ketoconazole, a proven dandruff-fighting ingredient, with salon-tested gentleness. Use it just twice a week in between your regular shampoos to control dandruff. It's gentle enough to use on color-treated, chemically processed and gray hair and has a thick, rich lather that rinses clean and leaves your hair smelling fresh. This ketoconazole shampoo binds to the natural protein of your hair and works between shampoos to eliminate the fungus that causes dandruff. You can also use your favorite hair-care products or salon shampoos in between treatments.