What is COSRX AC Collection Calming Liquid Intensive? COSRX AC Collection calming liquid intensive uses a blend of AHAs, BHAs, glycolic acid, and propolis extract that work alongside zinc PCA to create the brand’s exclusive Intensive Acne Care complex. This complex helps reduce the visible appearance of pores and imperfections, promoting a visibly clarified complexion. Gentle enough for daily use, the exfoliating formula lightly removes pore-clogging dead skin cells, leaving the skin looking brighter and smoother. Who can use COSRX AC Collection Calming Liquid Intensive? For oily and acne-prone skin.