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COSRX The Niacinamide 15 Serum is 
a high-concentration, oil-free formula designed for acne-prone and oily skin to minimize pores, reduce excess sebum, and fade acne scars. It features 15% niacinamide, Zinc PCA, and Acetyl Glucosamine, offering a lightweight, quickly absorbed texture that smoothes rough skin.
Key Benefits & Features:
How to Use:
  1. Apply a few drops of the serum to cleansed, dry, or slightly damp skin.
  2. Gently massage into the skin, focusing on areas with acne, oiliness, or enlarged pores.
  3. For daytime use, always follow with sunscreen.
  4. Note: Due to the high concentration of niacinamide, it is recommended to patch test first to ensure tolerance, especially for sensitive skin.
Ingredients:
Water, Pentylene Glycol, Niacinamide, Butylene Glycol, Acetyl Glucosamine, 1,2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol.