COSRX Niacinamide 15% Face Serum, 0.67 fl oz — Pore-Minimizing, Oil-Control Lightweight Formula

A lightweight 15% niacinamide serum from COSRX designed to refine pores, regulate excess oil, and improve overall skin texture without heavy residue.

This concentrated COSRX Niacinamide 15% Face Serum combines high-strength niacinamide with Zinc PCA to target enlarged pores, uneven tone, and surface texture. Formulated for everyday use, the fast-absorbing liquid layers smoothly under moisturizers and makeup. It’s made to integrate into morning or evening routines with clear directions for application and a recommendation for sun protection during daytime use.

How quickly will I notice visible changes to my pores and texture?

Results depend on your skin’s starting point and consistency, but many users report smoother texture and reduced oiliness within several weeks of regular use. Because the formula concentrates active niacinamide at 15%, small improvements often appear sooner than with lower-strength products.

• Use 2–3 drops once or twice daily for best effect.
• Apply to clean, slightly damp skin to improve absorption.
• Expect gradual improvement over 4–8 weeks with consistent use.

Will this serum irritate sensitive or reactive skin?

High-concentration niacinamide can be well tolerated by many, but stronger actives may cause sensitivity in some users. COSRX recommends a preliminary patch test and slowing frequency if irritation appears; discontinue use and consult a professional if persistent reactions occur.

• Perform a patch test 24 hours before full-face use.
• Start with once-daily application or every-other-day to assess tolerance.
• Avoid direct contact with the eyes and stop use if severe irritation develops.

How do I incorporate this serum into my daily skincare routine?

This lightweight serum is designed to fit between cleansing and moisturizing steps. For daytime, follow with a broad-spectrum SPF 30+ sunscreen to protect results; at night, layer a hydrating moisturizer or treatment as needed.

• Cleanse, tone (optional), apply 2–3 drops of the serum, then moisturize.
• Use sunscreen during daytime to prevent sun-related discoloration.
• Can be applied under-eye carefully, avoiding direct eye contact.

What active ingredients make this product effective?

The key actives are 15% niacinamide and Zinc PCA. Niacinamide helps the skin look smoother and more even, while Zinc PCA contributes to oil regulation and helps reduce the chance of future congestion.

• 15% niacinamide for pore appearance and tone refinement.
• Zinc PCA to help control excess sebum and support clearer skin.
• Lightweight carrier base for quick absorption beneath moisturizers.

Who this is for: This COSRX Niacinamide 15% Face Serum suits people seeking a targeted pore-minimizing and texture-refining product—especially those with oily, combination, or congestion-prone skin. It’s also appropriate for users wanting a potent niacinamide treatment layered into existing routines, provided they perform a patch test first and use sun protection during the day. If you have very reactive skin or active dermatitis, consult a dermatologist before introducing high-strength actives.

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