COSRX Niacinamide 15% Face Serum, 0.67 fl oz — Pore-Refining, Oil-Control Treatment

This Korean-formulated serum combines a high 15% niacinamide concentration with Zinc PCA to address uneven texture and excess sebum without heavy silicones or thick oils. Fast-absorbing and suited for layering, it works into your routine morning or night (use sunscreen during the day). The pump/dropper delivers just a few drops for targeted application on the nose, chin, cheeks, or areas of congestion.

How quickly will I notice smaller pores and smoother skin?

Visible changes depend on your skin and routine consistency. Many people report refined texture within a few weeks when used regularly, while deeper congestion may take longer to improve. Combine with gentle cleansing and sun protection for best results.

• Contains 15% niacinamide to help regulate oil production and refine pore appearance.
• Zinc PCA helps reduce surface oil that can make pores look larger.
• Use 2–3 drops once or twice daily for gradual improvement.

Is this serum safe for sensitive or breakout-prone skin?

The formula avoids heavy occlusives, but its high niacinamide concentration can be strong for some very reactive skin. COSRX recommends a patch test before full-face application and starting with once-daily use if you have sensitivity.

• Patch test on the inner arm for 24 hours before face use.
• Reduce frequency if redness or irritation appears; consult a clinician if severe reaction occurs.
• Zinc PCA supports blemish-prone skin by helping control surface oil.

How do I include this serum in my daily skincare routine?

Apply to clean, toned skin before heavier creams and sunscreens. For daytime use, follow with an SPF 30+ product to protect results; at night, follow with moisturizers or targeted treatments as needed.

• Apply 2–3 drops to face once or twice daily after cleansing and toning.
• Gently pat into areas with enlarged pores or uneven texture; avoid direct eye contact.
• Layer beneath sunscreen in the morning and a light moisturizer at night.

What precautions should I take when using this serum?

Because of the high active concentration, introduce the serum gradually. Avoid combining with other potentially irritating strong actives at first, and always protect skin from sun exposure after use.

• Perform a patch test before first use and wait 24 hours for reactions.
• Avoid using at the same time as high-strength AHAs/BHAs until tolerance is established.
• Do not apply directly into eyes; can be used in the under-eye orbital area with caution.

Who is this for? This serum is intended for people seeking a targeted, high-strength niacinamide treatment to address enlarged pores, oily areas, and uneven skin texture—especially those comfortable introducing concentrated actives into their routine. It can suit combination, oily, and many normal skin types, but those with very reactive skin should start slowly and perform a patch test. Integrate with sun protection and a gentle base routine for predictable, layered results.

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