American Crew Anti Dandruff Shampoo stops the itchiness associated with dandruff. The active ingredient, Zinc Pyrithione, helps prevent the itching and flaking associated with dandruff. Anti-Dandruff Shampoo is also an ideal treatment shampoo for use during winter months, in dry climates, or 1-2 times a week for healthy scalp maintenance. Hair looks cleansed, moisturised and looking fantastic.