COSRX The Niacinamide 15 Serum Reviews

Name: The Niacinamide 15 Serum
Brand: COSRX
Rating: 4.59 (744 reviews)

4.59

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120 Reviews

곰돌데쓰
May 11, 2025
Dry Skin
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Pros
The texture is water-like and absorbs well into the skin! I have dry skin and I'm using this in the first step of my routine.
Cons
I don't have any particular complaints. While I haven't seen noticeable results yet, I plan to keep using it consistently.

landsua
May 4, 2025
Dry Skin
Review under verification
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
The absorption is fantastic! I thought it wouldn't absorb well because of its water-like texture, but it absorbs really well! I also noticed it had a positive effect on my skin texture.
Cons
I tried this because COSRX is famous, but I didn't see any dramatically noticeable effects.
Tip
It worked even better when used together with a vitamin serum.

제주캄큘
Apr 28, 2025
Combination SkinSensitive SkinAcne Skin
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I stumbled upon this product during a sale and bought it at a great price. What a pleasant surprise! It turned out to be a perfect match for my skin. It absorbs well and leaves my skin feeling comfortable.
Cons
I'm not quite sure about any specific benefits, to be honest. While it absorbs nicely and feels moisturizing, I can't help but feel something's missing. It seems to lack that extra oomph, you know?

o2oa
Apr 25, 2025
Combination SkinAcne Skin
Review under verification
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
It's super lightweight and absorbs well! It's really amazing when used with the COSRX Skin Booster
Cons
For some reason, maybe because of the high niacinamide content, I feel like I get slight blemishes when I use it daily, so I only use it occasionally
Tip
COSRX Skin Booster is a must-have

가벼운흰뺨오리
Apr 16, 2025
Combination SkinSensitive SkinAcne Skin
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I've been using this for about 2 months. Skin Sensitivity: As someone with extremely sensitive, acne-prone skin, I found this product to be surprisingly gentle and non-irritating. While it hasn't dramatically transformed my blemishes, I've noticed gradual improvements. Texture: The formula has a slightly rich consistency. Absorption: It absorbs well into the skin.
Cons
Due to its rich texture, I wouldn't particularly recommend this for those with oily skin. If you have even the slightest scratch or wound on your face, it can cause a tingling sensation.

양이데스
Apr 11, 2025
수부지Sensitive SkinAcne Skin
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
- Light and absorbs like a toner - The tingling sensation feels like it's penetrating the skin, which is actually a good thing - Unlike other blemish-removing products from different brands that felt like serums and didn't work, this one tingles (maybe that's why?) and showed results in just 2 weeks when used every other day - Absorbs well, saving time
Cons
- Disappointing amount as it runs out quickly - Feels like there's not enough product for the price

feel있게
Apr 7, 2025
Oily SkinAcne Skin
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
As someone in their 20s with oily skin, the most important factor when choosing skincare products is seeing results without irritation. In that regard, COSRX The Niacinamide 15 Serum is a product I'm truly satisfied with! From the first use, I was impressed by its refreshing feel and how quickly it absorbs into the skin. Even on sensitive days, it sinks in gently without any irritation. Most importantly, I really felt the effects of niacinamide, the key ingredient in this product. Due to my oily skin, I tend to have enlarged pores and blemish marks that linger, but with consistent use of this serum, my pores have visibly cleared up and blemish marks have significantly faded. That's why I've been using it consistently for over a year now. Personally, this product works really well for my skin. I started with a lower concentration version and have now settled on this higher concentration one. If you find it suits your skin, I'd definitely recommend trying the higher concentration. I especially want to recommend this to those with oily skin. It noticeably reduces oiliness and sebum production, resulting in less shine and an overall more even and smooth complexion. Among all the niacinamide products I've tried, this one is by far the most satisfying, and I plan to continue using it in the future!
Cons
Be careful when using, as any spills around the bottle opening can leave white marks!

jydoo30
Apr 3, 2025
Dry Skin
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Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
The way it absorbs is beyond my expectations. I have extremely dry skin, but this product eliminates all dryness. What sorcery is this? Haha! I've finally found my holy grail for niacinamide with this product.
Cons
There wasn't much to complain about. If anything, maybe the size could have been a bit larger?
Tip
As most of you probably know, I use this alongside vitamin C and retinol products.

슥잉z
Apr 3, 2025
Combination SkinSensitive SkinAcne Skin
Review under verification
The content is currently being reviewed by the Hwahae operations team, and the verification will be completed by the next business day (excluding weekends and holidays) from the date the review was written.
Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
✨COSRX The Niacinamide 15 Serum Review✨ This is my personal holy grail..! With its high concentration of 15% niacinamide, it's truly exceptional for treating blemishes, enlarged pores, and dull complexion. When applied as the first step in your skincare routine, it absorbs quickly and enhances the absorption of subsequent products! Despite its lightweight, non-sticky texture, you can really feel your skin becoming firmer after absorption, making it perfect for daily use. It's especially great when you want to simplify your skincare routine - this one product alone makes a noticeable difference! For those with super sensitive skin, I recommend starting with a small amount to test :) I was very satisfied with how gentle it is, considering the 15% concentration ◠‿◠
Cons
There were no downsides! It's a legendary holy grail.. I feel uneasy without it!

깨끗한쇠개개비48121
Apr 2, 2025
Oily SkinAcne Skin
Review under verification
The content is currently being reviewed by the Hwahae operations team, and the verification will be completed by the next business day (excluding weekends and holidays) from the date the review was written.
Reviewed by The Hwahae Testers
This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
It absorbs quickly and has a lightweight texture that spreads easily on the skin
Cons
The price is a bit steep. It would be great if it came in a larger size