The ANUA Niacinamide 10% + TXA 4% Serum is a viral Korean skincare product targeting dark spots, dullness, and uneven tone with powerful brighteners like Niacinamide, Tranexamic Acid, and Arbutin, plus hydrating Ceramides and Hyaluronic Acid, offering a lightweight, watery texture and nature-driven pink color, suitable for most skin types but best for hyperpigmentation concerns. It's used after cleansing, before moisturizer, can be applied AM/PM (with SPF in daylight), and helps fade marks, reduce pores, and improve radiance, though patch testing is wise due to its high active concentration. Brand new in box