MEDICUBE TXA Niacinamide 15% Serum is a high-potency brightening serum formulated with 15% niacinamide and tranexamic acid to target dark spots, uneven skin tone, and dullness while refining pores and strengthening the skin barrier. Its lightweight, non-sticky formula is suitable for all skin types, especially those dealing with hyperpigmentation, discoloration, or oily and acne-prone skin.