It may occur for several reasons including sensitivity to hair care products ... active ingredients in dandruff shampoos are zinc pyrithione, selenium sulfide, ketoconazole, and salicylic acid.

All products featured on GQ ... 7 years—and it works fabulously. The shampoo combines two key active ingredients in anti-dandruff rinses: Selenium sulfide and salicylic acid.

Mack Rachal, MD, PhD: Generally you want to shampoo three to five times a ... and in some patients they overreact to those. Selenium sulfide works by both decreasing the amount of flaking that ...