COSRX The Niacinamide 15 Serum is a high-strength serum with 15% niacinamide (vitamin B3) and zinc PCA. It helps oily-looking skin, the look of pores, uneven-looking tone and post-acne marks look more even and refined with daily use, and suits oily, combination and normal skin that already tolerates actives. This COSRX niacinamide serum is the original from COSRX in 20ml, shipped from Seoul with Cash on Delivery.
COSRX Niacinamide 15 Serum at a glance
| Brand | COSRX |
|---|---|
| Size | 20ml |
| Product type | High-strength niacinamide serum |
| Key ingredients | 15% niacinamide (vitamin B3) with zinc PCA |
| Best for | Oily-looking skin, the look of pores, uneven-looking tone and post-acne marks |
| Texture and finish | Light serum that layers easily under moisturiser and sunscreen |
| When to use | Morning or evening, after toner and before moisturiser; sunscreen every morning |
| Sold in Pakistan by | Korean Skincare Pakistan — an Official Authentic seller of COSRX in Pakistan |
Is COSRX Niacinamide 15 Serum right for your skin?
Best for
- Oily and combination skin that gets shiny and shows visible pores
- Post-acne marks and uneven-looking tone
- Skin that already uses a lower-strength niacinamide and wants a step up
Skip it, or patch-test first, if
- You are new to niacinamide or your skin is sensitive: start with the gentler ANUA Peach 70% Niacinamide Serum
- Your skin flushes, itches or stings with niacinamide: patch-test on the jawline for 24 hours first
How do you use COSRX Niacinamide 15 Serum?
Morning
- Cleanse and apply toner.
- Press 2–3 drops of the serum into the skin.
- Follow with moisturiser and a broad-spectrum SPF 50 sunscreen.
Evening
- Cleanse and apply toner.
- Apply the serum, or use it after a vitamin C serum in the morning instead.
- Seal with moisturiser.
Start once a day for the first two weeks, then use it twice a day if your skin stays comfortable. Brightening results need daily sunscreen.
What are the key ingredients in COSRX Niacinamide 15 Serum?
- Niacinamide (15%) — vitamin B3; helps oily-looking skin, the look of pores and uneven-looking tone and supports the skin barrier
- Zinc PCA — a zinc salt often paired with niacinamide for oily-looking skin
- Panthenol (vitamin B5) — helps skin feel comfortable and hold moisture
COSRX Niacinamide 15 Serum vs COSRX Vitamin C 23 Serum: which should you choose?
| COSRX Niacinamide 15 Serum | COSRX Vitamin C 23 Serum | |
|---|---|---|
| Key active | 15% niacinamide | 23% vitamin C (ascorbic acid) |
| Main goal | Oily-looking skin, look of pores, uneven-looking tone | Antioxidant step, dull skin, more radiant-looking tone |
| Best time to use | Morning or evening | Morning, under sunscreen |
| Tingling | Less common | Common at first |
Choose the Niacinamide 15 Serum if oiliness, pores or post-acne marks are your main concern. Choose the Vitamin C 23 Serum if dullness is your main concern and you wear sunscreen every morning. Many people use both: vitamin C in the morning, niacinamide in the evening.
How can you tell if your COSRX Niacinamide 15 Serum is original?
- The serum should be clear to slightly milky, smooth and almost unscented; a separated, gritty or perfumed liquid is a warning sign.
- The box should be sealed, with the COSRX name, product name and ingredient list printed clearly; blurred printing or spelling mistakes suggest a copy.
- A price far below other trusted sellers usually means old stock or a fake.
- Check the batch code printed on the box and the bottle: the two must match, and the code should look printed, not stuck on. Every unit we sell is batch-code checked on arrival in Seoul, and we verify any code for free — see how to check if Korean skincare is original.
Similar products to consider
- COSRX The Vitamin C 23 Serum 20ml
- ANUA Niacinamide 10% + TXA 4% Serum
- Jumiso Niacinamide 20 Serum 40ml
Related guides and collections
- All COSRX products in Pakistan
- Is Korean Skincare Pakistan an official authentic COSRX seller?
- Niacinamide skincare in Pakistan
- Korean skincare for oily skin
Korean Skincare Pakistan is a Seoul-based authorised seller of major 40+ K-beauty brands. Every product is 100% original, batch-code verified on arrival and shipped from our Seoul warehouse, delivered to your door in 5–7 days nationwide with Cash on Delivery.
COSRX Niacinamide 15 Serum: frequently asked questions
Is the COSRX The Niacinamide 15 Serum at Korean Skincare Pakistan original?
Yes. Korean Skincare Pakistan is an Official Authentic seller of COSRX in Pakistan. Our stock is bought from official COSRX channels in Seoul, every unit is batch-code checked on arrival and shipped from our Seoul warehouse. If a product is ever not original, an old batch or near expiry, you can return it free within 7 days.
Is 15% niacinamide too strong?
For skin that already tolerates niacinamide, it is usually fine. Some people notice short-lived redness or tingling at first. Start once a day and build up. If your skin is sensitive or new to niacinamide, a 5–10% serum is a gentler first step, and higher strength is not always better.
How long does COSRX Niacinamide 15 take to show results?
Oiliness and the look of pores can change within a few weeks. Post-acne marks and uneven-looking tone take longer, usually a couple of months of daily use. Daily sunscreen makes a big difference, because sun exposure keeps marks looking dark.
Can I use it with vitamin C, BHA or retinol?
Yes. Niacinamide is one of the easiest actives to combine. Use vitamin C in the morning and this serum after it or in the evening. It also pairs well with BHA and retinol at night. Add one new active at a time, and wear sunscreen every morning.
Is COSRX a good brand for acne-prone skin?
COSRX is popular with acne-prone skin because many of its products are simple, focused formulas, such as the Low pH Good Morning Cleanser, the BHA Blackhead Power Liquid and this niacinamide serum. Choose by your concern, patch-test new products and keep the routine short.
Where can I buy the original COSRX niacinamide serum in Pakistan?
The original is sold here by Korean Skincare Pakistan, an Official Authentic seller of COSRX in Pakistan. Each bottle comes from official COSRX channels in Seoul, is batch-code checked and is delivered in 5–7 days with Cash on Delivery. The live price and stock show right under the Add to Cart button.
