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The Vitamin C 13 Serum

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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

Regular price $21.00
Regular price Sale price $21.00 (-0%)

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.

• 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

  • 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
The Vitamin C 13 Serum
The Vitamin C 13 Serum
Regular price $21.00
Regular price Sale price $21.00 (-0%)
Tiffany F. us
✔ Verified Reviewer
Age35-44
Skin TypeOily
★★★★★
Very effective and I didn’t
01/06/26
Very effective and I didn’t have any allergic reaction. Made my acne scars fade
Ally C. us
✔ Verified Reviewer
Age25-34
Skin TypeNormal
★★★★
The smell is a little
17/04/26
The smell is a little iffy and I don’t love having to put it in the fridge but it works well!
Janet F. us
✔ Verified Reviewer
Age65+
Skin TypeDry
★★★★★
My Go To Vitamin C
25/03/26
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.
Maria S. us
✔ Verified Reviewer
Age45-54
Skin TypeDry
★★★★★
Awsome
18/03/26
Awsome
Dora S. us
✔ Verified Reviewer
Age35-44
Skin TypeDry
★★★★★
I lost count how many
17/03/26
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.