This COSRX BHA Blackhead Power Liquid is a gentle yet effective exfoliant that contains 4% natural BHA component of Betaine Salicylate, which not only gets rid of blackheads and sebum inside of the pores, it also prevents sebum turning into blackheads via oxidation and helps skin rebuild its moisture barrier. Willow Bark Extract and Niacinamide also help brighten skin with gentle exfoliation, while sodium hyaluronate boosts hydration.