This TonyMoly Inkey Library ampoule is formulated with niacinamide (vitamin B3) as its core active, aimed at brightening dull, uneven-looking skin tone while also helping to minimize the appearance of enlarged pores. Supporting ingredients such as zinc PCA help balance excess oil, while hyaluronic acid and panthenol add hydration and soothe the skin, making the formula reasonably gentle for daily use. It's suited to most skin types, particularly those dealing with dullness, dehydration, or oiliness, and is easy to layer into an existing routine. Apply a few drops onto cleansed, toned skin morning and night, following up with moisturizer and, during the day, sunscreen. A straightforward, accessible option for anyone building out a brightening-focused Korean skincare routine.