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Cosrx The Vitamin C 13 Serum ($16, originally $21)

Stock up on vitamin C and get the bestselling Cosrx Vitamin C 13 Serum. It's formulated with 13 percent vitamin C to achieve brighter, more even-toned skin. Enhancing the main ingredient's power is tocotrienol, which helps to combat discoloration while strengthening the skin's natural defense against environmental factors. The hydrating serum can be used during the day or at night.