What is COSRX The Niacinamide 15 Serum?
COSRX The Niacinamide 15 Serum is a high-strength vitamin B3 serum from COSRX's "The" line of focused actives. Each 20ml bottle carries 15% niacinamide alongside zinc PCA and acetyl glucosamine, a trio aimed at the things that bother oily and breakout-prone skin most: shine, visible pores, rough texture and the brown or red marks that linger after a pimple has gone.
The formula is short, with only fifteen ingredients, and the texture is a light, slightly slippery serum that disappears quickly. It is designed to sit between toner and moisturiser and to layer cleanly under sunscreen, which makes it practical for both morning and evening routines.
Is 15% niacinamide too strong?
It is at the higher end of what you will find in skincare. Many people tolerate it well, especially oily skin types, but if you have never used niacinamide or your skin is reactive, start slowly or begin with a gentler, lower-strength option first.
COSRX The Niacinamide 15 Serum benefits: what it does for your skin
Niacinamide is one of the most versatile actives in skincare, and this serum puts it to work on several concerns at once.
Less shine through the day
Niacinamide and zinc PCA help balance oil, so skin that turns shiny by lunchtime in Karachi's humidity tends to stay fresher for longer with regular use.
Smoother-looking pores and texture
When oil is better controlled and the surface is gently refined by acetyl glucosamine, pores look less prominent and rough patches feel smoother.
Fading the look of post-acne marks
Niacinamide helps even out the look of skin tone, so dark marks left by old breakouts gradually look softer. Pair it with daily sunscreen; without sun protection, marks linger far longer.
A calmer, stronger barrier
Niacinamide also supports the skin's barrier, and allantoin adds a soothing touch. Over time, many people find their skin less reactive and better able to handle other actives.
COSRX The Niacinamide 15 Serum key ingredients
| Ingredient | What it does |
|---|---|
| Niacinamide (15%) | Balances oil, refines the look of pores, evens tone |
| Zinc PCA | Helps regulate sebum and calm the look of breakouts |
| Acetyl glucosamine | Gently refines the surface and supports a brighter look |
| Allantoin | Soothes and comforts |
| Trehalose | Helps hold moisture in the skin |
There is no added fragrance, no essential oils and no alcohol in the ingredient list, which keeps the formula focused and easier on sensitive-leaning skin.
Is COSRX The Niacinamide 15 Serum right for your skin type?
Oily and combination skin
This is where it shines. Oily and combination skin that shows visible pores and gets shiny quickly will see the most benefit. Explore more ideas in our oil control edit.
Acne-prone skin and post-acne marks
It is a good support step for breakout-prone skin and is especially useful for fading the look of leftover marks. For active breakouts, combine it with a gentle BHA cleanser such as the COSRX Salicylic Acid Daily Gentle Cleanser, and browse our acne and blemish picks.
Sensitive skin
Because 15% is a strong dose, sensitive skin should introduce it gradually: every other evening for the first week or two. If you notice persistent stinging or redness, use it less often or switch to a lower strength.
Dry skin
Dry skin can benefit from niacinamide's barrier support, but this serum is not hydrating on its own. Follow it with a nourishing moisturiser, or layer it over a hydrating essence like the COSRX Advanced Snail 96 Mucin Power Essence.
Who should patch-test first
Anyone new to niacinamide, anyone with rosacea-prone or very reactive skin, and anyone using several actives at once should test the serum on the jawline for a few days before using it on the whole face.
How to use COSRX The Niacinamide 15 Serum (morning and night)
Morning
- Cleanse with a gentle face wash such as the COSRX Low pH Good Morning Cleanser.
- Apply toner if you use one.
- Smooth two to three drops over the face, working from the centre outwards.
- Follow with moisturiser and finish with sunscreen.
Evening
- Double cleanse to remove sunscreen.
- Apply the serum to dry or slightly damp skin.
- Seal with moisturiser.
How often should you use it?
Once a day is plenty for most people, and many get great results using it only in the evening. Oily skin that tolerates it well can move to twice daily after a few weeks.
What can you mix it with?
Niacinamide pairs well with hydrating serums, retinoids and most moisturisers. You can use it with vitamin C, such as the COSRX The Vitamin C 23 Serum, but if your skin is sensitive, use vitamin C in the morning and niacinamide in the evening. Avoid stacking it with several strong exfoliants on the same night.
COSRX The Niacinamide 15 Serum results: how long until you see a difference?
Most people notice less shine and a smoother feel within two to three weeks. The look of pores and texture usually improves over four to eight weeks, while post-acne marks take longer, often two to three months of consistent use together with daily sunscreen. Everyone's skin is different, so give it at least a month before judging.
Does COSRX The Niacinamide 15 Serum have side effects?
The most common reaction is temporary tingling or mild redness, usually in the first week and usually when the serum is applied to freshly washed, damp skin or layered with exfoliants. Applying it to dry skin and using it every other day at first helps. Niacinamide should not cause purging, so if you see a cluster of new breakouts that does not settle, pause and let your skin recover.
COSRX Niacinamide 15 vs ANUA Niacinamide serum
Both are popular niacinamide serums, but they suit different needs.
| COSRX The Niacinamide 15 | ANUA Peach 70% Niacinamide | |
|---|---|---|
| Strength | High (15%) | Gentler daily dose |
| Main focus | Oil, pores, post-acne marks | Glow and gentle brightening |
| Texture | Light, slippery serum | Milky, hydrating serum |
| Best for | Oily skin used to actives | Beginners and sensitive skin |
Choose COSRX if oil and pores are your main concern and your skin is used to actives. Choose the ANUA Peach 70% Niacinamide Serum if you want a softer, more hydrating introduction to niacinamide. For a budget-friendly zinc formula, The Ordinary Niacinamide 10% + Zinc 1% is another option.
COSRX The Niacinamide 15 Serum price in Pakistan
The current price of the 20ml bottle is shown live on this page. Because you only need a few drops, a bottle typically lasts six to eight weeks of daily use. Spend Rs. 6,000 or more for free delivery, with cash on delivery available nationwide.
Original vs fake COSRX The Niacinamide 15 Serum: how to check
A genuine bottle has crisp, evenly printed labelling, a sealed box with a batch number and expiry date that match the bottle, and a clear, light serum with no noticeable scent. Be wary of blurry print, labels that peel easily, a strong smell or a thick, cloudy texture.
Buying from the right seller matters most. YESBEAUTY is an authentic seller of COSRX in Pakistan, with every unit sourced directly from COSRX's official distribution channels in Seoul, Korea, and covered by our 7-day return guarantee if a product is ever found inauthentic. See our Authenticity Promise and the full COSRX range.
Best niacinamide serum for oily skin in Pakistan: where it fits
For oily, acne-prone skin dealing with shine and marks in a hot climate, COSRX The Niacinamide 15 is one of the strongest options we stock. For a gentler start, look at ANUA, and for more choices see our niacinamide collection and dark spot picks.
