The Niacinamide 15 Serum

COSRX The Niacinamide 15 Serum is a highly concentrated facial serum formulated with 15% niacinamide, supported by N‑acetyl‑glucosamine and Zinc PCA to provide comprehensive acne care, sebum control, and overall skin tone improvement. Its lightweight, fast-absorbing texture is ideal for oily, combination, and acne-prone skin—but it’s gentle enough for most skin types, including sensitive skin.

Benefits:

• Controls oil and reduces breakouts: Niacinamide helps regulate sebum production and calm inflammation, contributing to acne reduction.
• Minimizes enlarged pores: Visible reduction in pore size and blackheads reported in clinical testing.
• Fades dark spots & hyperpigmentation: N‑acetyl‑glucosamine works synergistically with niacinamide to gradually improve uneven skin tone.
• Soothes and repairs skin: Zinc PCA and allantoin calm irritation and support skin barrier recovery.
• Clinically supported results: In a 4‑week trial, users saw up to ~50% reduction in sebum, significant decreases in blackheads and whiteheads, plus improvements in pigmentation and redness.
• Widely praised by users & skincare editors: Known for improving texture, reducing shine, and brightening the complexion within a few weeks of consistent use.

How to Use:

• After cleansing and toning, apply 2–3 drops during the serum step.
• Gently massage from the center of the face outward until fully absorbed. Avoid eye contact.
• Use morning or evening—if applying in the morning, follow with SPF 30 or higher.
• Avoid layering with other strong actives like vitamin C or exfoliating acids to reduce irritation risk. Many users recommend alternating nights or time of day.

COSRX is a Korean skincare brand known for its science-backed, minimalist formulas designed to target specific skin concerns with high-performance ingredients.