OUAI Scalp Serum in Beauty: NA. OUAI Scalp Serum in Beauty: NA. Healthy hair starts with the scalp. This skincare-inspired serum helps balance and hydrate your scalp to create an ideal environment for hair to thrive.. Targets concerns of Thinning, Flaky/Dry Scalp & Volume. Formulated without Gluten, Parabens, and Silicones. Vegan and cruelty-free. 2 oz/ 57 g. Start application in your natural part and along your hairline Use short, quick presses to release drops throughout the scalp. Massage in to help distribute and absorb into the scalp.. Can be applied in the am or pm on wet or dry hair.. OUAR-WU127. FG-0411-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.