Serum with vitamin C 13% COSRX The Vitamin C 13 Serum

COSRX The Vitamin C 13 Serum is a lightweight daily serum built around 13% pure vitamin C, a concentration low enough to ease into a routine yet enough to help skin look brighter and more even over time. The texture is thin and watery, so it sinks in quickly and layers well under moisturiser without feeling heavy or tacky.

What it does for your skin

• Helps the complexion look brighter and more radiant with daily use
• Supports a more even-looking tone and helps soften the appearance of dark spots and discolouration
• Adds lightweight hydration for smoother-looking, more comfortable skin
• Helps skin texture look refined and pores appear less noticeable

Key ingredients

• 13% pure vitamin C – a brightening antioxidant that helps improve the look of dull, uneven tone and discolouration.
• Tocotrienol (a form of vitamin E) – an antioxidant that pairs with vitamin C to support a fresher-looking complexion.
• Hyaluronic acid – draws in moisture for plumper, more hydrated-looking skin.
• Allantoin – a soothing, comforting ingredient that helps keep the formula gentle.

How to use

Apply a small amount to clean, dry skin in the morning or evening, after toner and before moisturiser. Pat gently until absorbed. You can use it around the eye area, but avoid direct contact with the eyes. Because vitamin C works well alongside sun protection, follow with SPF during the day. If you are new to vitamin C, start a few times a week and build up as your skin gets used to it.

Who it's for

A good everyday choice if you want to add vitamin C to your routine and prefer a light, fast-absorbing formula. The gentle, hydrating base makes it suitable for most skin types, including drier or more easily reactive skin. As with any new product, patch test first.