Your skin works hard every day — battling UV exposure, pollution, and the natural slowdown of cell turnover that comes with age. The COSRX Vitamin C 13 Serum gives it the backup it needs. Formulated with a 13% concentration of pure Ascorbic Acid, this serum strikes the balance between genuinely effective and kind to skin — making it a brilliant choice whether you're new to Vitamin C or simply done with formulas that irritate more than they improve.
The texture is light, non-greasy, and absorbs quickly without leaving any residue. You might notice a natural golden tone to the formula — that's simply what real, unmasked Vitamin C looks like, and a good sign you're getting the genuine article.
With consistent use, expect a complexion that looks more balanced, more rested, and noticeably brighter over time.
What your skin gets:
- Targeted fading of dark spots, post-acne marks, and uneven pigmentation
- A more balanced, luminous skin tone over time
- Antioxidant defence against daily environmental stressors
- Deep hydration from Sodium Hyaluronate to keep skin plump and comfortable
- Soothing support from Allantoin, ideal for reactive or easily irritated skin
Pore-refining and brightening benefits from Niacinamide
Lightweight, non-occlusive moisture from Squalane
How to use
After cleansing and toning, dispense 2–3 drops into your fingertips and press gently into the skin, working from the centre of the face outward. Follow with your usual moisturiser. If using in the morning, always apply SPF 30 or higher as your final step — Vitamin C and sun protection are a powerful pairing. A patch test is recommended before first use, and a gentle shake before each use keeps the formula performing at its best.
💡 Ready for more? If you've been using Vitamin C consistently and your skin is comfortable with this concentration, the COSRX Vitamin C 23 Serum is your natural next step. With a higher 23% pure Ascorbic Acid concentration and clinically measured results, it's built for skin that's ready to take things further. Consider the C 13 your foundation — the C 23 is where the real intensity begins.
💡 Store in a cool, dark spot — or pop it in the fridge — to extend the life of your Vitamin C.
Ingredients:
Water, Ascorbic Acid (13%), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-O-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Squalane, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glycyrrhiza Glabra (Licorice) Root Extract