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COSRX The Niacinamide 15 Serum, Main, color,
COSRX The Niacinamide 15 Serum, Alternate, color,

The Niacinamide 15 Serum

COSRX

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

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Details & care

What it is: A total acne care serum formulated with 15% niacinamide.

Who it's for: Ideal for all skin types.

What it does: The highly concentrated serum combines maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control. It is noncomedogenic and won't clog pores.

Research results:

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

- 45.27% improvement of activated sebaceous glands

- 48.07% improvement of oil synthesis amount

- 42.72% improvement of number of blackheads

- 50% improvement of number of whiteheads

- 15.50% improvement of hidden melasma and blemishes

- 19.47% improvement of pigmentation (visible melasma and blemishes)

- 2.59% improvement of triple-complexion skin tone (brightness)

- 24.89% improvement of triple-complexion skin tone (redness)

- 11.73% improvement of triple-complexion skin tone (yellowness)

How to use: After cleansing, during the serum phase, apply a few drops of the Niacinamide serum to the skin. Use fingertips to gently massage and absorb the serum, starting from the center of the face, working towards the edges. Use the serum in the morning, evening or afternoon. If applied during the morning/day, be sure to use sunscreen with an SPF of 30 or higher.

  • 0.67 oz.
  • Item #10133858

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Reviews

(1764)
4.5 out of 5
Write a Review

Most helpful positive review

May 9, 2026
CosRx is my favorite affordable
[This review was collected as part of a promotion.] CosRx is my favorite affordable skincare!! This stuff is great - works well for my husbands backne!
Paigen J.
Reposted from cosrx

Most helpful critical review

Sept 13, 2024
Not worth it. All the
[This review was collected as part of a promotion.] Not worth it. All the products that claim to help acne are garbage. They caused more irritation and acne rather than helping. Also, it caused my skin to be so dry and leave white cast as if they added high amount of alcohol. not good.
ritika g.
Reposted from cosrx

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5 stars
63%
4 stars
24%
3 stars
8%
2 stars
2%
1 star
1%
Sort by Most Helpful
Paigen J.
Reposted from cosrx
May 9, 2026
CosRx is my favorite affordable
[This review was collected as part of a promotion.] CosRx is my favorite affordable skincare!! This stuff is great - works well for my husbands backne!
Pablo U.
Reposted from cosrx
May 9, 2026
Helps me a lot with
[This review was collected as part of a promotion.] Helps me a lot with my skin texture reducing the pores.
Na K.
Reposted from cosrx
Apr 6, 2026
I'm currently using it. It's
[This review was collected as part of a promotion.] I'm currently using it. It's been about a week, and it's good.
Eva E.
Reposted from cosrx
Apr 4, 2026
The has no residue and
[This review was collected as part of a promotion.] The has no residue and provides firmness and control
Amira L.
Reposted from cosrx
Apr 2, 2026
My skin cannot survive without
[This review was collected as part of a promotion.] My skin cannot survive without this! Gentle enough for sensitive skin. Help prevent stubborn blemishes and control oil
Kristina C.
Reposted from cosrx
Mar 26, 2026
The serum is light weight
[This review was collected as part of a promotion.] The serum is light weight and leaves my skin looking and feeling great. Over time I have noticed that my pores are smaller and I don’t see as many white heads. This is a regular in my routine.
Load 6 more reviews
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