COSRX The Niacinamide 15 Serum

COSRX The Niacinamide 15 Serum is a high-strength serum with 15% niacinamide designed to help control excess sebum, refine the appearance of enlarged pores and improve uneven skin tone and post-blemish marks.

The lightweight, non-sticky formula combines 15% niacinamide with N-acetylglucosamine (NAG), Zinc PCA, trehalose, pullulan and allantoin. It absorbs easily and helps support smoother, clearer and more balanced-looking skin without a heavy finish. COSRX especially recommends it for oily, combination and blemish-prone skin, while also listing it as suitable for sensitive skin.

Benefits

• Helps reduce excess sebum and oily shine.
• Helps refine the appearance of enlarged pores.
• Helps improve uneven skin tone and post-blemish marks.
• Helps smooth rough skin texture.
• Lightweight, non-sticky texture.
• Non-comedogenic and dermatologist tested.

Who is it for

• Oily skin.
• Combination skin.
• Blemish-prone skin.
• Skin with enlarged pores.
• Skin with uneven texture or post-blemish marks.
• Sensitive skin according to individual tolerance.

Main ingredients

• Niacinamide 15% – helps regulate excess sebum, refine pores and improve uneven-looking tone.
• N-Acetylglucosamine (NAG) – helps support smoother texture and brighter-looking skin.
• Zinc PCA – helps support balanced sebum care.
• Trehalose – helps maintain hydration and skin comfort.
• Pullulan – provides moisturizing and skin-conditioning care.
• Allantoin – helps soothe and soften the skin.
• Tocopherol – provides antioxidant skin-conditioning care.

How to use

After cleansing and toning, apply a few drops of COSRX The Niacinamide 15 Serum to problem areas or evenly over the entire face. Gently pat until absorbed, then follow with moisturizer. Use sunscreen during the daytime. A patch test is recommended before facial use.

FAQ

How much niacinamide does COSRX The Niacinamide 15 Serum contain?
The formula contains 15% niacinamide.

Can COSRX The Niacinamide 15 Serum be used with vitamin C or retinol?
COSRX recommends not using high-strength vitamin C, retinol or AHA/BHA products at the same time as this serum. Use them at different times of the day or on different routines to reduce the risk of irritation.

Is COSRX The Niacinamide 15 Serum suitable for oily and blemish-prone skin?
Yes. COSRX specifically recommends it for oily, combination and blemish-prone skin and has completed non-comedogenic testing.

Warnings

• For external use only.
• Patch test before first facial use.
• Use sunscreen during the daytime.
• High concentrations of niacinamide may cause redness, itching or irritation in some users.
• Avoid using at the same time as high-strength vitamin C, retinol or strong AHA/BHA products if this causes irritation.
• Discontinue use if persistent irritation occurs.