Clinically Proven: Clinically proven to control flaking, scaling and itching from dandruff. Nizoral is so powerful it can even control severe dandruff. Controls Scalp Fungus: Nizoral is different because it doesn’t just address the symptoms, it gets right to the root of dandruff as it kills the fungus that causes it. Ketoconazole 1%: The only over the counter dandruff shampoo with Ketoconazole 1%, a clinically proven, powerful dandruff fighting ingredient. 10X More Effective: The active ingredient in Nizoral is 10X more effective at killing scalp fungus, the primary cause of dandruff, than the active ingredient in the leading dandruff shampoo based on lab testing (not a product to product comparison) Gentle On Hair: Gentle enough to use on color treated, chemically processed, or gray hair. Clean fresh scent and you only have to use it 2x per week.