Numbuzin 5+ Glutathione Vitamin Tone-Up Serum is a light daily serum that helps make skin look brighter, more even, and fresh. It supports dull skin and helps fade dark marks with regular use. Key Benefits Brightens skin tone by giving a clean and healthy glow. Helps reduce dark spots and acne marks over time. Makes skin look smooth and clear without feeling heavy. Supports the skin barrier and keeps skin comfortable. Gentle formula that suits daily use, even for sensitive skin. How to Use After washing your face, take a small amount of serum. Gently spread it over the face and neck. Use morning and night before cream.