OUAI Anti Dandruff Shampoo in Beauty: NA. OUAI Anti Dandruff Shampoo in Beauty: NA. This gentle shampoo with salicylic acid helps reduce flaking, itching, and irritation associated with dandruff while leaving hair feeling clean and soft.. Targets dandruff, flaky and dry scalps, and scalp buildup. Vegan and cruelty-free. Soothes and relieves dry scalp Leaves hair feeling clean and soft. 10 fl oz.. Wet hair and apply ANTI-DANDRUFF SHAMPOO directly to the scalp.. Work into a lather, focusing on the scalp.. Leave on for five minutes. Rinse thoroughly. For best results, use at least twice a week.. OUAR-WU129. FG-0140-A-00. Founded by hair stylist to the stars Jen Atkin, OUAI - pronounced way - originated HAIRGOALS. The mane addicts at OUAI believe that life is hard and looking good should be easy. That's why their line of luxury shampoos, conditioners, and styling products was designed to nourish hair and bring out its natural beauty - no glam squad necessary.