Nizoral controls scalp fungus by targeting the root cause of dandruff. It contains 1% Ketoconazole, a powerful, clinically proven ingredient. Lab tests show it's 10 times more effective at killing scalp fungus than the leading dandruff shampoo. Nizoral 2-IN-1 also includes conditioning properties for soft, smooth, and manageable hair. It's gentle enough for color-treated, chemically processed, or gray hair, has a clean fresh scent, and only needs to be used twice a week.