COSRX The Niacinamide 15 Serum

COSRX The Niacinamide 15 Serum

Target excess oil, visible pores, post-breakout marks, and uneven texture with COSRX The Niacinamide 15 Serum, a high-strength daily serum designed to help refine and balance blemish-prone skin while leaving it smoother, clearer, and more even-looking.

Formulated with 15% niacinamide, zinc PCA, N-acetylglucosamine, and allantoin, this lightweight serum helps support total breakout care and oil control. Niacinamide helps reduce the look of excess shine, enlarged pores, and uneven tone, while zinc PCA helps support sebum balance for a fresher, less greasy-looking complexion. N-acetylglucosamine helps improve the appearance of post-acne marks and rough texture, while allantoin helps comfort and soothe the skin.

This serum is a great choice for anyone looking for a K-beauty niacinamide serum, oil-control serum, or a pore-refining serum for acne-prone skin. Its fast-absorbing, non-heavy texture makes it easy to layer into both morning and evening routines for skin that looks clearer, smoother, and more balanced over time.

Overview

COSRX The Niacinamide 15 Serum is a concentrated treatment serum created to help support oil control, pore care, texture refinement, and post-breakout care in one step. Designed especially for oily, combination, and blemish-prone skin, it helps improve the look of shine, congestion, and uneven skin tone while keeping skin feeling comfortable.

Study Results

According to the brand’s reported clinical results after 4 weeks of use, this serum showed:

• 50% decrease in whiteheads
• 48.07% improvement in oiliness
• 45.27% reduction in visible pores
• 42.27% decrease in blackheads
• 24% reduction in redness
• 19.47% improvement in pigmentation

The brand also states that the formula is non-comedogenic tested, dermatologist tested, and hypoallergenic tested. Individual results may vary.

Key Benefits

• Helps reduce the look of excess oil and shine
• Supports improvement in visible pores and rough texture
• Helps improve the appearance of post-acne marks and uneven tone
• Formulated with 15% niacinamide, zinc PCA, N-acetylglucosamine, and allantoin
• Fast-absorbing texture with a comfortable finish
• Great for oily, combination, and blemish-prone skin

How to Use

After cleansing and toning, apply a few drops to problem areas or the entire face. Gently pat until absorbed, then follow with moisturizer. Use sunscreen during the daytime. Patch testing is recommended before full facial use.

Explore the full lineup and Shop COSRX skincare today — or browse more korean skincare favorites.

Hello, Glow! Shine Soft, Texture Smooth

Pores looking loud? Shine showing up early? Say hello to COSRX The Niacinamide 15 Serum ($25.00) — a 15% niacinamide hit from COSRX for the look of oil control, pores, and post-breakout marks without a heavy finish.

This is the serum step for people shopping korean beauty products who want clearer-looking, more even-looking skin — cosmetic appearance language, not a medical acne fix.

Real Ways to Use This Serum

• After cleanse and toner: A few drops on problem areas or the whole face, pat until absorbed, then moisturizer — classic korean skincare layering.
• For oily / combination days: Reach for it when you want help with the look of excess shine and visible pores without a sticky feel.
• Post-breakout mark focus: A good pick when uneven tone and rough texture from past breakouts are the concern (appearance only).
• Daytime habit: Use sunscreen as your final daytime step — already called out in How to Use above.
• Brand-reported study note: For the brand’s reported clinical percentages, see the Study Results section above — individual results may vary. This product does not diagnose, treat, or cure acne.

Texture Check (Because Feel Matters)

Think lightweight, fast-absorbing drops — not a thick mask. Pat on COSRX The Niacinamide 15 Serum, let it settle, and keep going. Smooth. Balanced-looking. Ready for cream or SPF.

Glow Pairing Ideas

• Firmness / fine-lines companion: Layer with COSRX The 6 Peptide Skin Booster Serum when you want peptide support in the same COSRX routine.
• Seal with cream: Follow with COSRX Hyaluronic Acid Intensive Cream when skin wants a hydrating finish.
• More COSRX: Explore the full COSRX lineup for more best korean skincare picks from the brand.

Who This Serum Glows For

• Shoppers hunting korean skincare products for a high-strength niacinamide / oil-control serum
• Fans of k beauty skincare who want the look of refined pores and smoother texture
• Anyone focused on the appearance of post-breakout marks and uneven tone
• Glow-chasers browsing korean skincare brands for COSRX serum energy

Shop the Glow

Grab the COSRX The Niacinamide 15 Serum ($25.00) at SayHelloToGlow.com. Free shipping on orders over $200. Prefer to keep browsing? Explore more korean skincare products across the shop.

Glow Questions, Answered

Is 15% niacinamide strong?
It’s a high-strength daily serum on the page — patch test first, then build into your routine as comfort allows.

Does this diagnose, treat, or cure acne?
No. Cosmetic appearance language only (shine, pores, uneven tone, post-breakout marks). It does not diagnose, treat, or cure acne. See a professional for medical concerns.

What about the study percentages?
Those are brand-reported clinical results in the Study Results section above. We don’t restate them as guaranteed outcomes. Individual results may vary.

Can I use it in the morning?
Yes — after cleansing and toning, then moisturizer, and use sunscreen during the daytime.

Is SayHelloToGlow.com an official COSRX site?
No. SayHelloToGlow.com is an independent korean skincare website that carries authentic korean beauty products and korean cosmetics from brands like COSRX (and other korean skincare brands across the shop). It is not the official brand site.

Do you carry other K-beauty favorites too?
Yes — browse the korean skincare shop for more best korean skincare finds beyond this serum.