ONE THING Niacinamide Glutathione Serum is a lightweight Korean brightening serum that targets dark spots and uneven skin tone. Niacinamide (vitamin B3) helps fade hyperpigmentation and strengthen your skin barrier, while glutathione is a powerful antioxidant that supports a brighter, more even complexion. The watery texture absorbs quickly without residue, making it easy to layer into any routine. Who is This For?: Suitable for all skin types, this serum is especially helpful for anyone dealing with dullness, dark spots, or uneven tone—but works well for those simply wanting antioxidant protection in their daily routine too. Key Benefits: - Helps reduce the appearance of dark spots and hyperpigmentation over time - Supports a more even, radiant complexion with triple vitamin C and glutathione - Lightweight, fast-absorbing formula that layers well under other products - Contains adenosine for skin-smoothing benefits Key Ingredients: - Niacinamide — Helps fade dark spots, minimize pore appearance, and support a healthy skin barrier - Glutathione — An antioxidant that protects against environmental stress and promotes a brighter complexion - 3-O-Ethyl Ascorbic Acid, Ascorbic Acid, Sodium Ascorbyl Phosphate — Three forms of vitamin C for enhanced brightening and antioxidant protection - Adenosine — Known for its skin-smoothing and softening properties