cosrx two in one poreless power liquid, 100ml / 3.38 fl.oz | tightening pores | korean skin care, vegan, cruelty free, paraben free cosrx two in one poreless power liquid is dually able for your pore care with bha to help clean the pores, tannin to help tighten them. this liquid is also effective for cooling down skin temperature and controlling excessive sebum production. since this liquid contains only 0.1% of bha, it can be used with other aha or bha products.