revents skin aging UV rays in everyday life create active oxygen in the skin, which causes damage to the skin barrier and pigmentation, which are both causes of skin aging. Vitamin C suppresses the active oxygen with its antioxidant properties, and protects damaged skin cells from UV rays, delaying the aging process. 2. Brightens Skin Vitamin C not only inhibits melanin synthesis, but also reduces oxidized melanin to help make your skin look bright and beautiful. 3.  Improves Skin Elasticity Vitamin C promotes collagen, an important factor in skin moisturization and elasticity, making your pores smaller and your skin have more elasticity. 4. Exfoliation Vitamin C has the effect of dissolving the remaining dead skin cells on your skin, improving dull skin tone evenly and brightly.