Prairie NATURALS Avalanche Therapeutic Shampoo is a unique frequent-use formula that effectively fights dandruff while leaving hair soft, manageable and healthy looking. Concentrated with nutrient-rich plant extracts, Avalanche Therapeutic Shampoo effectively treats the itching and flaking associated with dandruff resulting from seborrhea sicca (dry, flaky dandruff) and seborrhea oleosa (oily dandruff).