Nizoral A-D is clinically proven to control dandruff by addressing flaking, scaling, and itching. It contains 1% Ketoconazole, a powerful ingredient that kills the fungus causing dandruff, making it 10X more effective at fighting scalp fungus than leading dandruff shampoos. Gentle enough for color-treated, chemically processed, or gray hair, it has a fresh scent and only needs to be used twice a week.