COSRX’s The Niacinamide 15 Serum is formulated with 15% niacinamide, paired with zinc PCA to deeply refine the appearance of pores, regulate excess sebum, and help reduce the look of post-acne marks. Ideal for oily, combination or blemish-prone skin, it delivers a clearer, smoother, more even complexion with continued use.
*Non-comedogenic tested - doesn't clog the pores.
Size : 20ml / 0.67 fl. oz
| Concern | Suitable | Key Benefit | Key Ingredient |
|---|---|---|---|
| Excess oil & sebum | Yes | Controls oil & shine | Niacinamide 15% |
| Enlarged pores | Yes | Refines and minimizes pores | Niacinamide + Zinc PCA |
| Uneven tone & marks | Yes | Brightens and fades spots | Niacinamide + Acetyl Glucosamine |
| Rough texture | Yes | Smooths surface | Niacinamide + Allantoin |
| Acne & breakouts | Yes | Soothes and clears | Niacinamide + Zinc PCA |
| Info | Details |
|---|---|
| Volume | 20mL |
| Key Ingredients | 15% Niacinamide, N-acetylglucosamine, zinc PCA, Allantoin |
| Clinically Proven | Yes (Non-comedogenic tested, Dermatologist tested) |
| Expiration | 36 months from manufacturing or 12 months after opening |
| Allergens | Hypoallergenic tested |
| Feature | Niacinamide 15 | Typical Serum |
|---|---|---|
| Niacinamide Concentration | 15% niacinamide + acetyl glucosamine + zinc PCA | Usually 5–10% |
| Skin-Target Test Result | Sebum reduced ~50% after 4 weeks | Not always tested |
| Texture | Absorbs easily, non-comedogenic | Heavy / tacky |
| Suitable skin types | Especially for oily & combination skin. Also suitable for sensitive skin (with Allantoin). | Often specified for fewer skin types |
Clinically proven to reduce sebum by up to 50% in 4 weeks. Tested by the Dermacosmetic Skin Science Laboratory Co., Ltd.
Based on a 4-week clinical study conducted by Dermacosmetic Skin Science Laboratory Co., Ltd., Korea.
whiteheads decreased
oiliness improved
pores reduced
blackheads decreased
redness reduced
pigmentation improved
All clinical trials were conducted by Dermacosmetic Skin Science Laboratory Co., Ltd. From Aug 27 to Oct 11, 2022, on 20 subjects.
For those who constantly struggle with excess oil, clogged pores, or breakouts and want a serum that restores balance without irritation.
Perfect for anyone looking to smooth rough texture, improve the appearance of pores and support a clearer, more even complexion
Best for those struggling with redness or dark spots left behind by acne, seeking a calmer and more radiant complexion.
Great for those who prefer a gentle, clinically proven formula that helps strengthen the skin barrier without irritation.
Limited-Time Offer
COSRX The Niacinamide 15 Serum contains a 15% concentration of niacinamide combined with Zinc PCA. This formula helps regulate sebum production, minimize the appearance of enlarged pores, and help breakouts care while calming redness. The lightweight, non-sticky texture makes it ideal for oily and congested skin that needs active yet gentle care.
Niacinamide helps support by balancing excess oil production and strengthening the skin barrier, which helps reduce the buildup of sebum inside pores. Over time, this helps pores appear smaller and skin texture become smoother. The addition of Zinc PCA in COSRX’s formula enhances this oil-control effect for visibly clearer skin.
Clinical tests by the Dermacosmetic Skin Science Laboratory showed visible improvements in 4 weeks, including a 45% decrease in pore size, 48% reduction in oiliness, and improvement in skin tone and blackheads.
It’s best not to use AHA & BHA, Vitamin C, or Retinol at the same time, as they can be too strong when combined. Instead, use them at different times of the day. Hydrating ingredients like Hyaluronic Acid or Peptide Serum, however, are gentle and can be used together for added moisture.
Yes. The high-strength niacinamide and Acetyl Glucosamine combination targets dark spots and uneven tone caused by acne. Clinical data shows a 19% improvement in pigmentation and 15% reduction in blemishes after four weeks, helping restore skin clarity and radiance.
The formula is clinically proven and proven non-comedogenic, meaning it will not clog pores or trigger breakouts. It’s free from common irritants and formulated to calm redness, making it suitable for both acne-prone and sensitive skin types.
After cleansing and toning, apply 2–3 drops of the serum evenly across the face. Follow with a moisturizer to lock in hydration. The serum absorbs quickly and layers well under sunscreen or makeup, making it suitable for both morning and nighttime use.
Overall rating: 4.585945 / 5 from 1053 reviews.
This serum is praised for its ability to absorb well, leaving a light residue. Customers appreciate its smooth texture and the noticeable difference it makes to their skin, making it look smoother and more even-toned. It is also effective in reducing pimples and pores, and is non-comedogenic.
Review topics: ["size","fragrance","improvement","issues","weight","wrinkles","quality","scent","absorbs","irritation","design","works","results","skin","benefits","price","feels","texture","packaging","difference","looks","bottle","ingredients","shipping","amount","pores","face","serum","residue","acne"].
"Serum feels light weight. It has helped with the lines on my face and the overall appearance of my skin. Love using it during my nighttime routine."
"I’m concerned about the quality of the product I received, as it does not seem to be up to the standard I expected. I also noticed that the parcel had a shipping sticker from Mississauga, Ontario, even though I ordered directly from the official website and the tracking information indicated that the package was being shipped from the USA. This difference in shipping origin is concerning and raises some questions about the product’s source. In any case, my main concern is that the quality of the product does not seem satisfactory. I would appreciate it if you could please look into this and clarify the situation."
"I love the product, it lighten up my skin ,fine wrinkles disappeared, moisturizes my skin for the whole day. Highly recommended."
"This was my first application. All I applied to my face before this serum were hyaluronic witch hazel toner pads that I just wiped my face with. That’s it. Then when I applied this serum and I started to rub it in, it started to pill. Heavily. Is it supposed to do that? I was trying to apply this and then eventually add my makeup on my face but now worried it’s gonna pull"
"I have only been using this for a few weeks and have noticed improvements. I love the way it makes my skin look, hydrated and glowing. A little goes a long way. I layer this product on top of the snail mucin."
"Love this product, it really helps keep my acne under control."
"This is the most powerful niacinimide serum that I’ve used. It gives that glass skin perfection and makes skin look poreless"
"Its good"
"Just added this to my routine have been using the clearing pads for years and along with this new product my skin is looking even better. I will continue to buy!"
"Excellent!!"
