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SKU 100005002

The Niacinamide 15 Serum

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$15.89$17.46Save 9%

Only at SkinSeoul

We want you to feel reassured when purchasing your skincare products on SkinSeoul, so we offer an authentic product guarantee for all orders. We ship all orders direct from our warehouse in Korea and we guarantee that we will refund your order in full if you believe your product is inauthentic. If you are concerned about the authenticity of your product, please send us an email and our team will be able to assist.

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We are happy to price match an authorized retailer within 15 days of the purchase date under the following conditions:

  • The item must be available to purchase on the competitor’s website. We do not price match from eBay or clearance stores.
  • The item must be the same brand, product, variant, and volume.
  • Clearance and final sale prices will be matched solely at the discretion of our support team.

If you would like to make a price matching request, please send an email to our team and we’ll be able to assist.

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Enjoy free shipping on orders over $49

Product Information

COSRX The Niacinamide 15 Serum is formulated with a high concentration of 15% niacinamide and additional ingredients like Acetyl Glucosamine and Zinc PCA to effectively control oil, reduce pore size, and enhance skin texture. It offers comprehensive acne control, regulates sebum production, and exfoliates the skin for a smoother feel.
  • Contains 15% niacinamide, effectively controlling acne and improving skin texture.
  • Significantly reduces the appearance of large pores and congestion.
  • Regulates sebum and oil production, leading to smoother, softer skin.
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All Ingredients

Water, Pentylene Glycol, Niacinamide(15%), Butylene Glycol, Acetyl Glucosamine, 1, 2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol

Only at SkinSeoul

Price Matching Guarantee

We are happy to price match an authorized retailer within 15 days of the purchase date under the following conditions:

  • The item must be available to purchase on the competitor’s website. We do not price match from eBay or clearance stores.
  • The item must be the same brand, product, variant, and volume.

Clearance and final sale prices will be matched solely at the discretion of our support team. If you would like to make a price matching request, please send an email to our team and we’ll be able to assist.

Only at SkinSeoul

Return + Exchange Policy

  • Damaged/Faulty Products: If your order arrives damaged or faulty, please reach out to us within 5 days. You can choose between a replacement (with return shipping refunded) or a full refund (including return shipping).
  • Hazardous Items (e.g., broken bottles): Simply provide us with a photo or video of the item, and we’ll process your refund or exchange—no need to return the product.
  • Change of Mind Returns: If you’ve had a change of heart, we accept returns within 7 days, as long as the product is unopened & unused. Return shipping costs will be covered by the customer, and refunds will be issued after inspection.
  • Refund Processing Time: Credit card: 7-14 working days, PayPal: 3-5 working days.
  • Missing Items: If anything is missing from your order, please contact our support team with your order details & photos, and we’ll make sure to send the missing items to you as soon as possible.

For assistance,email support@skin-seoul.com – we’re here to help!

Only at SkinSeoul

3x Authenticity Guarantee

We want you to feel reassured when purchasing your skincare products on SkinSeoul, so we offer an authentic product guarantee for all orders. We ship all orders direct from our warehouse in Korea and we guarantee that we will refund your order in full if you believe your product is inauthentic. If you are concerned about the authenticity of your product, please send us an email and our team will be able to assist.