Nioxin® Scalp Recovery® Soothing Serum with pyrithione zinc is a leave-on treatment that helps relieve dandruff and scalp itching associated with seborrheic dermatitis. Helps prevent recurrence of flaking and itching associated with dandruff and seborrheic dermatitis. * *Regular use of the complete system. | Nioxin Scalp Recovery Soothing Serum 3. 38 fl. oz | Dermstore