Relieve flaking with Selsun 2.5% Extra Strength Anti-Dandruff Shampoo. This dry scalp treatment is formulated with 2.5% selenium sulfide to penetrate the surface of your scalp and relieve from the irritation and itch associated with dandruff. Selsun 2.5% Extra Strength Dandruff Shampoo controls symptoms associated with dandruff, seborrhea and tinea versicolor. Plus, it's enriched with vitamin B3 to keep your hair looking healthy and shiny. Simply apply the Selsun Blue 2.5% Extra Strength Shampoo for dry scalp to damp hair and rinse twice a week for two weeks for the treatment of dandruff and seborrhea. The shampoo fits easily in your duffle bag or shower thanks to its convenient 250ml sized bottle. To ensure this shampoo is right for you, always read and follow the label.