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The Vitamin C 23 Serum

COSRX

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This item is no longer available. Browse our recommendations for something similar.

Details & care

What it is: A pure vitamin C antioxidant brightening serum with high performance for preventing early signs of aging.

What it does: The serum helps fade scars, brighten skin and diminish fine lines and wrinkles.

Research results:

In a clinical trial on 20 subjects, over 4 weeks:

- 16.26% improvement of pigmentation (visible melasma and blemishes)

- 32.89% improvement of triple-complexion skin tone (red skin tone)

- 32.36% improvement of triple-complexion skin tone (skin radiance)

- 16.36% improvement of elasticity (internal elasticity)

- 38.65% improvement of the pore (volume)

- 27.18% improvement of the pore (count)

- 4.18 % improvement of skin age

How to use: Use the serum immediately and refrigerate after opening. After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side. Apply a few drops of the serum to skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face and working towards the edges. Keep the serum refrigerated.

  • 0.67 oz.
  • Item #10133860

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Reviews

(3661)
4.1 out of 5
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Most helpful positive review

Apr 26, 2026
Highly Recommend
[This review was collected as part of a promotion.] After using consistently I have started to notice my skin looking brighter and more even, and it gives me a really nice, natural glow without feeling heavy or greasy. Overall, this has been a great addition to my routine, and I definitely recommend it to anyone who has sensitive skin but still wants the benefits of Vitamin C.
Breana C.
Reposted from cosrx

Most helpful critical review

Sept 17, 2024
had to return
I honestly not sure how the product would have been if I continued to use, I had to return based on the smell. It was awful!
jessmar80
Verified purchase
Reposted from nordstrom.com

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5 stars
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Sort by Most Helpful
Breana C.
Reposted from cosrx
Apr 26, 2026
Highly Recommend
[This review was collected as part of a promotion.] After using consistently I have started to notice my skin looking brighter and more even, and it gives me a really nice, natural glow without feeling heavy or greasy. Overall, this has been a great addition to my routine, and I definitely recommend it to anyone who has sensitive skin but still wants the benefits of Vitamin C.
Eliza B.
Reposted from cosrx
Apr 24, 2026
This is the 3rd time
[This review was collected as part of a promotion.] This is the 3rd time I buy this serum! Does it smell like cat food? YES… does it oxidize rather quickly unless it kept in the fridge? Also yes, very annoying. And yet I continue to buy, because it works that well on my skin.
Brittany M.
Reposted from cosrx
Apr 23, 2026
Love this serum. Vitamin C
[This review was collected as part of a promotion.] Love this serum. Vitamin C 23 is already showing signs of dark spots fading.
Randall H.
Reposted from cosrx
Apr 7, 2026
Literally seeing brightening results in
[This review was collected as part of a promotion.] Literally seeing brightening results in less than 1 week.
Scout H.
Reposted from cosrx
Apr 5, 2026
Instantly brightening dull skin! Has
[This review was collected as part of a promotion.] Instantly brightening dull skin! Has made the biggest difference. The strength does irritate my skin at first but gets used to it quickly. Must be refrigerated!
Jimena G.
Reposted from cosrx
Apr 4, 2026
Great high quality, have seen
[This review was collected as part of a promotion.] Great high quality, have seen a difference in a week.
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