COSRX The Niacinamide 15 Serum 20ml

The COSRX The Niacinamide 15 Serum is a high-strength, single-ingredient-focused serum for people who want to put niacinamide to work on oil, pores, and uneven tone. At 15%, it sits at the potent end of the niacinamide scale, making it a targeted choice for oily, combination, and blemish-prone skin looking to control shine and refine the look of the surface.

What niacinamide at 15% does

Niacinamide, a form of vitamin B3, is one of the most versatile and well-tolerated ingredients in skincare. At this higher concentration, it focuses on helping balance oil production, refining the look of enlarged pores, supporting a more even tone, and softening the appearance of post-blemish marks. COSRX keeps the formula simple and no-frills, so you are getting a concentrated dose without a long list of extras.

Who it suits, with a caution

This is best suited to oily, combination, and blemish-prone skin that wants oil control and a smoother-looking surface. A 15% concentration is on the strong side, so if your skin is sensitive or new to niacinamide, start with it a few times a week and build up — and always patch test first. Some people find very high niacinamide levels can feel like too much, so listen to your skin.

How to use it

Apply a few drops to clean skin before your moisturiser, once a day to start. It layers comfortably with hydrating ingredients, and pairs well with a lightweight gel moisturiser for oily skin in Bangladesh's humidity. In the morning, always follow with sunscreen. Avoid stacking it with several other strong actives in the same step while your skin adjusts.

What to expect

Oil balance and pore refinement build gradually with consistent use rather than overnight. Used steadily, this serum is a focused, affordable way to work toward a shine-controlled, smoother-looking complexion — give it a few weeks, and keep the rest of your routine simple so you can judge how your skin responds.

Check on Delivery: Inspect the product carefully when you receive your order. Packaging can vary between batches while the product remains the same original item.

Storage: Store in a cool, dry place away from direct sunlight. Keep out of reach of children. Check expiry date on packaging before use.

Patch Test: If you have sensitive skin, apply a small amount to your inner wrist and wait 24 hours before full use. Stop use if irritation occurs.