Selsun Blue® Dandruff Shampoo Formulated with Caffeine. New! Full & thick - For fuller, thicker looking hair. Pyrithione zinc 1%. Strengthens hair & nourishes the scalp. Eliminates flakes & itch. 11 fl oz (325 ml). Use: For relief of flaking and itching due to dandruff and to help prevent its recurrence. ©2015 Chattem, Inc.