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  4. Serums & Treatments
(1781)1781

The Niacinamide 15 Serum

COSRX

$25.00Current Price $25.00
0.67 Ounce
1 person viewing now
Free returns anytime
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$60 off your next purchase—ends Dec. 1! Plus, earn 10 points per dollar Oct. 21–25. Terms apply. Apply Now

Highlights

  • Good for: Acne & blemishes
  • Good for: Dark spots
  • Good for: Redness

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
  • Core Product ID 3333337DXZ

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Reviews

(1781)17814.5 out of 5
Write a Review

Most helpful positive review

Oct 7, 2026

It does wonders for my

[This review was collected as part of a promotion.] It does wonders for my skin and keeps acne at bay while maintaining a healthy glow.
Melissa D.
Reposted from cosrx

Most helpful critical review

Sept 12, 2026

I use this mostly for

[This review was collected as part of a promotion.] I use this mostly for my night time skincare routine. This serum is great 👍. The texture is amazing. It has improved my skin appearance. Fading out dark spots and black heads. Give the skin a supple appearance.
Blessing O.
Reposted from cosrx

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5 stars64%
4 stars24%
3 stars8%
2 stars2%
1 star1%

Pros:

Cons:

Current reviews don’t mention any.
Oct 7, 2026

It does wonders for my

[This review was collected as part of a promotion.] It does wonders for my skin and keeps acne at bay while maintaining a healthy glow.
Reposted from cosrx
Melissa D.
Sept 30, 2026

Wow! A co-worker shared your

[This review was collected as part of a promotion.] Wow! A co-worker shared your products with me. I have scaring around my eyes and face due to terrible allergy symptoms. I have always taken care of my skin and took pride and how I looked. This was devastating for me to have scars on my face. I received your product and have been using it for a week and all I can say is how I cried because this helped me so much. I have seen the difference in my skin and I can’t say thank you enough.
Reposted from cosrx
Debora M.
Sept 28, 2026

Absorbs into my skin nicely.

Absorbs into my skin nicely. Has completely helped with random breakouts and evening my skin.
Reposted from cosrx
Alexandria G.
Sept 12, 2026

I use this mostly for

[This review was collected as part of a promotion.] I use this mostly for my night time skincare routine. This serum is great 👍. The texture is amazing. It has improved my skin appearance. Fading out dark spots and black heads. Give the skin a supple appearance.
Reposted from cosrx
Blessing O.
Sept 1, 2026

I chose this serum because

[This review was collected as part of a promotion.] I chose this serum because of its high quality ingredients and Cosrx's strong reputation The formula feels lightweight and absorbs easily. Since I have only recently started using it I would like to continue for at least a month to fully evaluate its long term results. So far my experience has been very positive.
Reposted from cosrx
Elvira I.
Aug 30, 2026

This serum helps keep my

[This review was collected as part of a promotion.] This serum helps keep my skin clear! It has even helped get rid of some deposits by my eyes.
Reposted from cosrx
Sara L.
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