TIRTIR Niacinamide 20% Serum is a powerful brightening and smoothing solution that targets dark spots, enlarged pores, and uneven skin tone. Formulated with 20% niacinamide, alpha-arbutin, glutathione, and hydrating hyaluronic acids, it helps fade blemishes, boost radiance, and improve skin texture. Infused with retinol and zinc PCA, it also supports anti-aging and barrier care. This lightweight, fast-absorbing serum is suitable for all skin types-including sensitive-and leaves your complexion visibly brighter, smoother, and more refined.