COSRX The Niacinamide 15 Serum Reviews

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

4.59

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103 Reviews

가벼운흰뺨오리
Apr 16, 2025
Combination SkinSensitive SkinAcne Skin
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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.

라나제이
Apr 16, 2025
Combination SkinSensitive 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
It's fragrance-free, incredibly gentle, and feels wonderfully moisturizing when applied. Plus, it doesn't cause any blemishes.
Cons
So far, I haven't found anything disappointing about using this product.

mt1223
Apr 14, 2025
Combination SkinSensitive 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
I didn't feel any irritation at all! Although I haven't been using it for long enough to notice dramatic effects, I was already using the Numbuzin Glutathione line and Nature Vitamin C ampoule. With this higher concentration, I can definitely feel the results. The texture is smooth, and unless you have very oily skin, I think the hydration and richness would suit anyone. It's a bit on the richer side for an ampoule, but it actually gives my skin a nice glow and keeps it from feeling dry, which I love. (I haven't seen any effects on dark spots yet though.)
Cons
I didn't experience any blemishes, and there wasn't really anything I found disappointing about it.

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!

풀밭점심
Apr 4, 2025
Oily 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
High concentration of niacinamide, yet it's gentle on the skin and absorbs beautifully!
Cons
While it's non-irritating, I find myself using it up quickly when layering due to the small amount in the bottle.

모순관리
Mar 25, 2025
Oily SkinSensitive 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
Among various niacinamide products (including 2%, 5%, 10%, and 20% formulations), this one offers the best balance of effectiveness with minimal irritation, making it suitable for long-term use
Cons
The price is on the steep side, and the packaging design makes it extremely difficult to use up the last bit of product
Tip
When used during the day, if you apply more than a certain amount (which you'll need to determine for your skin), it can leave a white cast similar to mineral sunscreens if you don't apply sunscreen over it. Adjusting the amount should solve this issue

유디니야
Mar 17, 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
As someone with super sensitive skin, I never thought I could use anything beyond hydrating and soothing products. I'm pleasantly surprised that this functional product is so gentle on my skin.
Cons
I don't have any major complaints. It seems like consistent use is necessary to see noticeable results.

지적인리트리버83233
Feb 17, 2025
수부지Sensitive 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
If your skin is dark or has a yellowish tint, I recommend trying it. My skin is not very dark, but I had a yellowish tint, so I was looking for basic products with niacinamide or vitamin C. When I applied them morning and evening, the yellowish tint was reduced to some extent, and my skin also became brighter thanks to the niacinamide. I went from a dark 21 shade to a 19 shade.♥️ It also absorbs quickly and is non-irritating, so even I, with sensitive skin, was able to use it. And when I used it, my oily, shiny face became much less oily!!!!!! (Using it together with the COSRX AHA/BHA Vitamin C Daily Toner also enhanced the effects!!)
Cons
There were no regrettable points, but after squeezing blemishes like acne, it stings when applied properly.

정적인메뚜기934716
Feb 8, 2025
Normal 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's gentle and nice~It seems effective~It's decent.
Cons
It's not exactly a life-changing product, but it's a decent one that doesn't disappoint. As for the price...?

졸부여사
Jan 24, 2025
Combination 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
I used to use 10% niacinamide, but I tried a higher concentration. The 15% is not at all irritating, and with other products I experienced peeling, but this product applies beautifully without any issues. I am very satisfied and am considering repurchasing.
Cons
The capacity seems small and the contents inside are not visible, so I'm not sure how much has been used.