COSRX AHA BHA Vitamin C Booster Serum 30mlAHA BHA Vitamin C Serum: Naturally sourced skin boosting serum to mildly exfoliate your skin to boost radiance with each use. Gentle Exfoliation: This lightweight watery serum seeps well into the skin while gently clearing away dead skin cells. Key Ingredient: Developed with naturally sourced ingredients 28. 5% Kiwi Fruit Extract, 28. 5% Dragon Fruit Extract, and 2% Niacinamide.