Numbuzin No.5 Glutathione Vitamin Concentrated Serum SetA multi functional brightening serum that helps to reduce the production of melanin, which can lead to a more even skin tone and reduce the appearance of dark spots and hyperpigmentation. Key Ingredient [Glutathione] that help to reduce oxidative stress and inflammation, can be effective at reducing the appearance of dark spots and pigmentation. Contains Niacinamide, a form of Vitamin B3 that can help reduce inflammation and hyperpigmentation.