Cosrx The Niacinamide 15 Serum

COSRX The Niacinamide 15 Serum is a concentrated brightening serum formulated with 15% niacinamide alongside zinc PCA and acetyl glucosamine. Designed for skin dealing with excess oil, dullness, and uneven tone, it delivers a high dose of niacinamide in a streamlined, minimal-ingredient formula meant for daily use.

Key Benefits

• Formulated with 15% niacinamide, a high-strength dose for visible results.
• Contains zinc PCA to help balance excess oil and support acne-prone skin.
• Includes acetyl glucosamine, which works alongside niacinamide for brightening.
• Helps even out the look of skin tone and refine visible pores over time.
• Minimal, fragrance-free formula suited to sensitive or reactive skin.

When to Use

Use morning and/or evening after cleansing and toner, before moisturizer. Suited to oily, blemish-prone, or dull, uneven-toned skin.

How to Use

Apply 2-3 drops or a small amount to clean, toned skin. Spread over the face and neck, pat until absorbed, then follow with moisturizer.

Key Ingredients

• Niacinamide (15%): a cell-communicating ingredient that supports brightening and a more balanced-looking complexion.
• Zinc PCA: helps regulate excess sebum and support blemish-prone skin.
• Acetyl Glucosamine: works synergistically with niacinamide for tone-evening benefits.
• Allantoin: soothes and supports skin comfort.

Precautions

Patch test before first use, as high-percentage niacinamide can cause temporary flushing or tingling on sensitive skin. Avoid direct eye contact and discontinue use if persistent irritation occurs. Store away from direct sunlight and heat. An independent re-check could not directly confirm the exact niacinamide percentage against a primary INCI source; the figure follows COSRX's naming convention but is not independently verified.