COSRX / Serums

COSRX The Vitamin C 13 Serum 20ml

$32.95

COSRX The Vitamin C 13 Serum is a daily brightening serum with 13% pure Vitamin C, Super Vitamin E (Tocotrienol), and Glutathione — a more gentle introduction to high-potency Vitamin C for daily brightening and even skin tone. 20ml.

13% Pure Vitamin C (Ascorbic Acid)
Super Vitamin E (Tocotrienol) & Glutathione
Hyaluronic Acid & Allantoin for Hydration
Ideal for Daily Use
Lighter Formula Than the Vitamin C 23

What It Is

A daily-strength brightening serum with 13% pure Ascorbic Acid, Glutathione, and Tocotrienol (Super Vitamin E) — improving skin tone, reducing discolouration, and providing antioxidant protection.

Why It's Different

Pairs 13% pure Vitamin C with Tocotrienol — which has up to 50x the antioxidant power of standard Vitamin E — plus Glutathione for multi-pathway brightening and Hyaluronic Acid for simultaneous hydration.

Who it's For

All skin types, especially those new to high-concentration Vitamin C who want daily brightening with a gentler formula than 23% options.

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

How to Use

Apply 2–3 drops to cleansed face in the morning, before moisturiser and SPF. Start with every other day to build tolerance if new to Vitamin C.

Bonza Nourishing

Skin-Beautifying Ingredients

Glutathione

Improve uneven skin tone and reduces dullness for a healthy glow

Sodium Hyaluronate

Hydrates and plumps the skin, reducing fine lines.

Panthenol

Hydrates, soothes, and repairs while strengthening the skin barrier for a healthier look.

Adenosine

Firm the skin, Improve elasticity, Reduce sagging

Niacinamide

Improves skin texture, reduces redness and inflammation, and minimizes pores

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Frequently asked questions

What is the difference between the Vitamin C 13 and Vitamin C 23 serums?

The Vitamin C 13 has 13% pure Vitamin C and is designed for daily use and those new to high-concentration Vitamin C. The Vitamin C 23 has 23% and is for advanced users who want maximum brightening intensity.

Can I use this with niacinamide?

Yes. This serum already contains a small amount of Niacinamide and works well with niacinamide-forward products. The brightening effects complement each other.

How should I store this serum?

Store in a cool, dark place away from direct sunlight. If the formula turns dark orange or brown, it has oxidised and should be replaced. Refrigerating can extend shelf life.

Do I need to wear SPF when using this?

Yes — always wear SPF during the day when using Vitamin C. Vitamin C makes skin more photosensitive, and SPF also maximises the antioxidant and brightening benefits.

Is this suitable for sensitive skin?

It's gentler than the 23% formula, with Allantoin and Panthenol to soothe. Sensitive skin users should patch test and introduce gradually, starting every other day.

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COSRX The Vitamin C 13 Serum 20ml

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COSRX The Vitamin C 13 Serum 20ml

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