Numbuzin No 5 Vitamin Concentrated Serum 30ml., This serum is one of the most popular brightening serums in the world. It contains many antioxidants and skin brightening ingredients. It is very good Numbuzin No.5 Glutathione Vitamin Concentrated Serum GHC 320, A brightening serum packed with glutathione and vitamins to help fade dark spots, improve uneven skin tone, and boost skin radiance for a numbuzin No.5+ Glutathione Vitamin Concentrated Serum, How to use * Apply 23 drops on clean, dry face * Use after toner, before moisturizer * Gently pat until absorbed * Use once daily (preferably at Fading Dark Spots and Hyperpigmentation with numbuzin's No.5 Line THE YESSTYLIST Product Question] Layering serum or not : r SkincareAddiction numbuzin No.5+ Vitamin Concentrated Serum 30mL+30mL Duo Set OLIVE YOUNG Global