The Niacinamide 15 Serum
COSRX
A high-concentration serum with 15% niacinamide and zinc PCA to help minimize pores, control sebum production, and improve uneven skin tone. Suitable for oily and combination skin types seeking oil control and texture refinement.
Key Ingredients
Humectant and antimicrobial preservative booster
Humectant and solvent for ingredient delivery
+ 10 more ingredients
Ingredient Effectiveness Data
Editorial baseline from K-beauty clinical research and community consensus. Real subscriber reports layer on as the community grows.
More Korean Serums
Frequently Asked Questions
What are the key ingredients in The Niacinamide 15 Serum?
The key active ingredients in The Niacinamide 15 Serum by COSRX include Niacinamide (Vitamin B3) (brightening, pore-minimizing, barrier-support), N-Acetyl Glucosamine (Exfoliant and skin brightener, supports hyaluronic acid), Zinc PCA (Sebum regulator and antimicrobial agent), Trehalose (Humectant and skin protectant), Pullulan (Film-forming agent and moisture-locking humectant). Drawing on K-beauty research and community consensus, key ingredients show 82% effectiveness for acne in oily skin types. Seoul Sister tracks ingredient effectiveness across 5,900+ K-beauty products to provide data-backed recommendations.
Is The Niacinamide 15 Serum good for sensitive skin?
The Niacinamide 15 Serum is a Korean serum by COSRX. Sensitive skin compatibility depends on individual triggers and allergies. Seoul Sister's AI advisor Yuri analyzes all 15 ingredients against your specific skin type, concerns, and known allergens to provide a personalized compatibility score. Common irritant ingredients like fragrance, alcohol denat, and essential oils are flagged automatically.
Is The Niacinamide 15 Serum good for oily skin?
For oily skin, the key factors in evaluating The Niacinamide 15 Serum are comedogenic ingredient ratings, oil content, and finish type. This serum contains 6 active ingredients. Seoul Sister's database cross-references each ingredient's comedogenic rating (0-5 scale) against your skin type to identify potential pore-clogging risks. Subscribe for a personalized oily skin compatibility analysis.
How much does The Niacinamide 15 Serum cost?
The Niacinamide 15 Serum by COSRX starts from $18.01 USD for 20ml, with prices ranging up to $25.00 across retailers. Seoul Sister tracks pricing at Olive Young and Soko Glam, with price drop alerts for Pro members. Seoul Sister does not sell products — we compare retailer pricing so you can buy from the source.
Where to buy The Niacinamide 15 Serum?
The Niacinamide 15 Serum by COSRX is tracked at Olive Young and Soko Glam. Prices start from $18.01 USD. Seoul Sister verifies retailer authenticity and tracks counterfeit indicators to help you buy genuine Korean skincare products. We are an advice platform and never sell products ourselves.
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