The COSRX The Vitamin C 13 Serum is a stable brightening serum formulated with 13% 3-O-ethyl ascorbic acid — a highly stable form of vitamin C that brightens dull skin, fades pigmentation and provides powerful antioxidant protection without the instability of traditional vitamin C.

Key Benefits

• 13% stable vitamin C brightens and fades pigmentation
• 3-O-ethyl ascorbic acid provides lasting potency without oxidation
• Reduces dullness and uneven skin tone with continued use
• Lightweight serum formula absorbs quickly without stickiness

How To Use

After cleansing and toning, apply an appropriate amount to the face and pat until absorbed. Use morning and evening. Always apply SPF in the morning when using vitamin C.