The COSRX BHA Blackhead Power Liquid 100ml is a gentle yet highly effective exfoliating toner formulated with 4% Betaine Salicylate, a milder BHA alternative to traditional salicylic acid, that penetrates deep into pores to dissolve stubborn blackheads, excess sebum, and dead skin cells, leaving skin visibly smoother, clearer, and more refined with consistent daily use.