COSRX The Niacinamide 15 Serum
By Nur → Last verified 9/29/2026
Price checked 9/29/2026
List price $25.00. Price-checked 2026-09-29.
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What we found
Based on how this product compares to others in the serums category, cross-referenced against retailer listings and market data.
Strengths
- + Brand-reported 24% redness reduction in 4 weeks
- + Sustained demand in the Korean market
Worth knowing
- - 15% niacinamide is a strong concentration -- best introduced gradually for sensitive skin
Key ingredients
These are the ingredients COSRX highlights for this product, cross-checked against general dermatological and cosmetic-chemistry sources, not a full INCI list.
Fragrance: confirmed fragrance-free.
| Ingredient | What it is | What it does for skin |
|---|---|---|
| Niacinamide | A form of vitamin B3, one of the most studied ingredients in cosmetic dermatology. | Strengthens the skin barrier by boosting ceramide production, helps even out tone by limiting pigment transfer to skin cells, and can reduce the look of enlarged pores. |
| Allantoin | A soothing compound, naturally occurring in some plants and also made synthetically. | Calms irritation and supports skin healing, often paired with other barrier-focused ingredients. |
| Tocopherol | The chemical name for vitamin E as typically used in skincare formulas. | Helps neutralize free radicals from UV and pollution exposure and supports the skin's moisture barrier. |
What the brand says
COSRX's own marketing claims, not our own findings.
- Formulated with 15% niacinamide, paired with zinc PCA to deeply refine the appearance of pores, regulate excess sebum, and help reduce the look of post-acne marks
- Brand-reported 24% redness reduction in 4 weeks
Research-Based
Our assessment comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. This product hasn't been hands-on tested yet. See our Methodology for what that distinction means.
Price history
Current price is the lowest we've recorded so far.
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Frequently asked
How much does COSRX The Niacinamide 15 Serum cost per mL?
$0.88 per mL (currently $17.50 for 20 mL).
Has COSRX The Niacinamide 15 Serum been hands-on tested?
Not yet. Our assessment for this product comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. See our Methodology for what that distinction means.
What are the key ingredients in COSRX The Niacinamide 15 Serum?
The ingredients COSRX highlights for this product include Niacinamide, Allantoin, Tocopherol.
Sources
Pricing and availability for this product were verified against the following retailer listings.