The Vitamin C 13 Serum

Use everyday like a daily vitamin C for your skin

A gentle, water-based vitamin C serum that provides moisture and absorbs quickly without stickiness. Lighter and more refreshing than the Vitamin C 23 Serum, it can be used daily. Regular use will fade blemishes, dark spots, and freckles, while improving overall skin tone.

Size : 20ml / 0.67fl. oz

$21.00
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Recommended for
COSRX The vitamin C 13 serum is ideal for those who want a Vitamin C product for daily use that also cares for hydrating and brightening the complexion.


Target concerns 
- Hyperpigmentation 
- Anti aging 
- Dullness


Texture
Non-sticky, lightweight, watery texture that absorbs well


Color
It has a slight yellowish tint, indicating that it contains pure vitamin C

Cleanse your skin and put a toner. Then apply few drops of serum to the skin. User fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges

KEY INGREDIENTS
• 13% Pure Vitamin C :
Improves discoloration and uneven skin tone.
💡Learn More about Vitamin C →


• Tocotrienol(Super Vitamin E) :
Boasts up to 50 times greater anti-oxidizing efficacy than Tocopherol.


• Hyaluronic Acid and Allantoin :
Provides moisture and relieves irritation.

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Full 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
DETAILS
HOW TO USE
INGREDIENTS

Recommended for
COSRX The vitamin C 13 serum is ideal for those who want a Vitamin C product for daily use that also cares for hydrating and brightening the complexion.


Target concerns 
- Hyperpigmentation 
- Anti aging 
- Dullness


Texture
Non-sticky, lightweight, watery texture that absorbs well


Color
It has a slight yellowish tint, indicating that it contains pure vitamin C

Cleanse your skin and put a toner. Then apply few drops of serum to the skin. User fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges

KEY INGREDIENTS
• 13% Pure Vitamin C :
Improves discoloration and uneven skin tone.
💡Learn More about Vitamin C →


• Tocotrienol(Super Vitamin E) :
Boasts up to 50 times greater anti-oxidizing efficacy than Tocopherol.


• Hyaluronic Acid and Allantoin :
Provides moisture and relieves irritation.

×

Full 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
🤖 Still not sure? Ask our AI Shopping Consultant.
PROVEN RESULTS

- After 4 Weeks

  • Hydration
    113.77% improvement in surface moisture (surface hydration)

  • Skin Texture
    20.17% improvement in skin texture (roughness)

  • Pigmentation
    16.07% improvement in pigmentation
    12.22% reduction in melanin area

  • Triple-Complexion Skin Tone
    31.92% improvement in redness
    15.6% improvement in yellowness
    3.94% improvement in brightness

  • Wrinkles & Elasticity
    10.64% improvement in wrinkles (eye area)
    19.64% improvement in external elasticity
    14.07% improvement in internal elasticity

  • Pores
    36.97% reduction in pore volume
    34.44% reduction in pore area
    27.12% reduction in pore count
    9.4% reduction in pore depth


    *Based on clinical trials of 21 subjects.
    *As a result of the clinical trials from Dermacosmetic Skin Science Laboratory Co., Ltd
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The Vitamin C 13 Serum
The Vitamin C 13 Serum

$21.00

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COSRX Advanced The Vitamin C 23 Serum bottle featuring Super Vitamin E and Hyaluronic Acid; high-potency 23% stabilized Vitamin C formulation designed to brighten dull skin, refine pores, and even skin tone while hydrating; minimal modern K-beauty packaging emphasizing clinical-grade clarity and gentle brightening care.
Advanced The Vitamin C 23 Serum

$25.00

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Best For

Beginners

Experienced users

Target Concern

• Hyperpigmentation
• Early signs of aging
• Dull, tired-looking skin

• Stubborn hyperpigmentation
• Visible signs of aging
• Persistent dullness and uneven tone

Main benefits

Mild hydrating & brightening care

Powerful brightening care

Overall rating: 4.6647725 / 5 from 176 reviews.

AI Generated Review Summary

The Vitamin C 13 Serum is a water-based formula that provides moisture and absorbs quickly without stickiness. Customers appreciate its ability to brighten dark spots, improve skin tone, and make the skin look fresh and radiant. Opinions vary on its scent and how it feels on the skin.

Summary topics

  • Dark Spots: 11%
  • Vitamin C Effectiveness: 6%
  • Face Brightness: 8%
  • Skin Tone Improvement: 6%
  • Absorption Speed: 5%

Review topics: ["absorbs","ingredients","results","fit","improvement","feels","spots","scent","texture","glow","formula","use","skin","looks","bottle","buy","face","complexion","difference","works","found","serum","vitamin c","reaction","application","moisturizer","makeup","cosrx","combo","friends"].

Review highlights

  • "I can feel my face so soft and radiant in the morning and it helped brighten some dark spots caused by acne scars." — Ma. G.
  • "Her skin looks fantastic and so hydrated also." — Chanda M.
  • "My complexion looks more radiant, and dark spots appear to be fading." — Neeru B.

Reviews

This is so soft and

"This is so soft and even on the skin. Does feel a bit sticky towards the end of application but if you let it dry into the skin that goes away. The scent is different, I won’t lie, but doesn’t linger post application. I have noticed lightening in my melasma since starting CosRx products, but I am using multiple products, so most likely from the combination of all. Great size bottle for the price. It is only 13% pure vitamin C, but it is helping with brightness."

— Mackenzie G. (5/5)

The smell is a little

"The smell is a little iffy and I don’t love having to put it in the fridge but it works well!"

— Ally C. (4/5)

My Go To Vitamin C

"Another COSRX product that I can't live without. It's the only Vit C I use and will continue to purchase. I did try the Vit C 23 but I definitely like how this one works on my aging skin better."

— Janet F. (5/5)

Very effective and I didn’t

"Very effective and I didn’t have any allergic reaction. Made my acne scars fade"

— Tiffany F. (5/5)

I lost count how many

"I lost count how many bottles I had purchased of this Vitamin C serum. My skin loves it and that is enough for me to come back to it."

— Dora S. (5/5)

I bought two packs of

"I bought two packs of Vitamin C 13 in January 2026. I emailed to request a refund because the serum has a very strong smell, but I haven't received a response yet."

— Susan P. (1/5)

I love this vitamin c

"I love this vitamin c its not to strong and don't cause my a reaction on my skin it a perfect fit for me I already see a improvement in the brightness and evenness of my Skin its working great for me and I will be buying it again"

— Cindy P. (5/5)

So far so good! This

"So far so good! This feels really light and smooth on my face. Hoping for a great results."

— Lisa V. (4/5)

This serum is fantastic -

"This serum is fantastic - it leaves my overall skin tone even and full looking. I am very happy with it."

— Bridgette K. (5/5)

I like the consistency of

"I like the consistency of it. It does have a smell that is not very pleasant. So far, I like the way it's working."

— Dana M. (3/5)

Q&A