The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
The Vitamin C 13 Serum
Cosrx

The Vitamin C 13 Serum

$ 21.00
Size: 0.68oz / 20ml
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About the Product

This daily brightening serum from COSRX delivers 13% pure Vitamin C (Ascorbic Acid), a potent antioxidant that helps fade dark spots and boost overall radiance. The lightweight formula absorbs quickly and pairs two forms of Vitamin C with hydrating ingredients like hyaluronic acid and panthenol for a balanced approach to brighter-looking skin.

Who is This For?

Suitable for all skin types looking to address dullness, uneven tone, or early signs of aging. Especially helpful if you're dealing with dark spots or hyperpigmentation, but works well as a daily antioxidant boost for anyone.

Key Benefits

  • Helps brighten and even out skin tone with 13% pure Ascorbic Acid
  • Provides extended antioxidant support through a stable Vitamin C derivative
  • Supports hydration and skin barrier function with Sodium Hyaluronate and Panthenol
  • Contains Niacinamide and Licorice Root to help address discoloration

Key Ingredients

  • Ascorbic Acid (13%) — Pure Vitamin C that delivers antioxidant protection and helps brighten skin
  • 3-O-Ethyl Ascorbic Acid — A stable Vitamin C form that extends brightening benefits over time
  • Niacinamide — Helps improve uneven tone and supports a healthy skin barrier
  • Sodium Hyaluronate — Draws moisture into skin for lasting hydration
  • Licorice Root Extract — Helps calm and even out skin tone
FAQs

Q: Can I use The Vitamin C 13 Serum with niacinamide products?
A: Yes, this serum already contains niacinamide in its formula and can be used alongside other niacinamide-containing products without issue.

Q: Can I use this with my retinol or exfoliating acids?
A: It's best to use them at different times—Vitamin C in the morning, retinol or AHA/BHA at night to avoid potential irritation.

Q: Should I use sunscreen when using this Vitamin C serum?
A: Yes, applying sunscreen during the day is recommended when using Vitamin C products, as they can increase skin's sensitivity to UV exposure.

Q: How long until I see results?
A: Most users notice improved radiance within 2-4 weeks, while fading dark spots and evening out skin tone typically takes 6-8 weeks of consistent use.

Q: Is this serum suitable for sensitive skin?
A: The 13% concentration is moderate, but if you have sensitive skin, start by using it every other day to assess tolerance before moving to daily use.

Q: How should I store The Vitamin C 13 Serum?
A: Store in a cool, dark place away from direct sunlight to help maintain the stability of the Ascorbic Acid; refrigeration can help extend efficacy.

Q: How do I know if my Vitamin C serum has gone bad?
A: If the serum turns dark orange or brown or develops an unusual smell, it has oxidized and should be replaced.

How to Use

Cleanse your face thoroughly and pat dry. Apply toner to prepare skin for serum absorption. Dispense a few drops of The Vitamin C 13 Serum onto fingertips. Gently massage into skin starting from the center of the face, working outward toward the edges. Allow the serum to fully absorb before applying moisturizer.

Ingredients

Water, Ascorbic Acid(13%), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-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

Standard delivery within 2–5 business days

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