For problem scalps. Use at least twice a week or as directed by a physician. Features... -Pyrithione Zinc helps prevent itching and flaking associated with dandruff -Menthol provides a natural, mild anesthetic -Methylisoyhiazolinone, an anti-microbial and anti-fungal agent Note...many times dry scalp is perceived as dandruff, when only a good quality shampoo & strict daily use of a conditioner is needed.