ProtoClinical k-beauty COSRX The Vitamin C 13 Serum 20ml single centered serum bottle on a white background with a slim dark cap and warm orange tones
ProtoClinical k-beauty COSRX The Vitamin C 13 Serum 20ml single centered serum bottle on a white background with a slim dark cap and warm orange tones
COSRX

COSRX The Vitamin C 13 Serum 20ml

$15.10
Comfortable Daily Wear
• Daily brightening care• Fades blemishies, dark spots and freckles• Improves overall tone• Refines skin texture• Reduces size of pores
For all skin types dealing with acne and breakouts: COSRX's serum with Vitamin C works from within to deliver visibly brightens skin tone and fades uneven patches, not just temporary comfort.
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An ultra-light lash style designed to give airy definition with minimal weight. The 0.07mm fine fibers create a softer lash effect that feels lighter and looks less dense on the eye.
Vitamin C
COSRX The Vitamin C 13 Serum 20ml
COSRX The Vitamin C 13 Serum 20ml Default Title
$15.10
Clinically proven actives Dermatologist tested 100% authentic Korean Cruelty-free
What's inside ·

Vitamin C, the repair molecule

Vitamin C (L-ascorbic acid) donates electrons to neutralize free radicals before they can damage collagen fibers and DNA. In this serum, Vitamin C targets acne and breakouts, delivering visibly brightens skin tone and fades uneven patches with consistent use.
Vitamin C
neutralizes free radicals and inhibits melanin production for brighter, more protected skin
The texture

Lightweight, absorbing serum

• Daily brightening care

• Fades blemishies, dark spots and freckles

• Improves overall tone

• Refines skin texture

• Reduces size of pores

All Skin Types dark spots uneven tone pores rough texture
Hover the swatch — it ripples like water

How to use

1

Step 1: After cleansing and toning, press 2 to 3 drops onto fingertips.

2

Step 2: Gently pat and press across forehead, cheeks, nose, and chin.

3

Step 3: Allow 30 seconds for full absorption before the next step.

4

Step 4: Follow with moisturizer. Use sunscreen in the morning.

Full transparency

Ingredients

Vitamin C neutralizes free radicals and inhibits melanin production for brighter, more protected skin. This focused formula puts all its power behind one proven active for maximum impact.

COSRX The Vitamin C 13 Serum 20ml is built around a daily vitamin C serum created for gentle brightening and texture support. Its ingredient story centers on vitamin C and supporting tone-care ingredients. In cosmetic formulas, these materials are used because they can help fade the look of blemishes and freckles, refine skin texture, and improve overall brightness without the intensity of a stronger treatment step. That matters for this product format because a serum format works well for daily use because it layers easily and can be spread evenly across the full face. Rather than promising instant transformation, the formula is designed to improve skin gradually through hydration support, barrier comfort, and steady visible refinement. With consistent use, that kind of approach can help skin look calmer, brighter, smoother, firmer, or more balanced depending on the product goal, while keeping the routine wearable. Texture also shapes performance: essences and serums layer easily, while creams create a more protective finish and targeted spot formulas stay focused where they are needed. In short, the science behind this product is ingredient synergy matched with a texture that helps those ingredients work in a practical daily routine.

The detail

Specs & details

FormatLightweight serum
SizeDefault Title
Skin typesAll Skin Types
Country of originSouth Korea
Pairs beautifully with

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Questions & answers

After cleansing and toning, before moisturizer. Serums deliver actives most effectively on freshly prepped skin.
Yes. Apply from thinnest to thickest consistency and allow each layer to absorb before the next.
Most users notice initial improvement within 2 to 4 weeks. For full benefits like visibly brightens skin tone and fades uneven patches, allow 6 to 8 weeks of consistent use.
Your skin begins adjusting. You may notice improved hydration and comfort before more visible changes like texture refinement become apparent.
Yes, this formula is developed to be compatible with all skin types dealing with acne and breakouts. If you have very reactive skin, patch test on the inner arm before full application.
The formula is designed to be well-tolerated. For pregnancy-specific concerns, consult your healthcare provider. For sensitive skin, patch test before full application.
Vitamin C neutralizes free radicals and inhibits melanin production for brighter, more protected skin. Consistent daily use is key to seeing the full benefits.
Check the INCI list for the most accurate information on fragrance components. The formula is developed for minimal irritation potential.
Store in a cool, dry place away from direct sunlight. Use within 12 months of opening for optimal freshness and efficacy.
Serums have a higher concentration of targeted actives than essences and a lighter consistency than most ampoules. They deliver the most potent treatment in your routine.
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About the brand

OriginSeoul, KR
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