COSRX The Niacinamide 15 Serum Reviews

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

4.59

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25 Reviews

잉새앵
Mar 5, 2025
Oily SkinAcne Skin
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Pros
The niacinamide ingredient seems great for evening out complexion and controlling sebum!
Cons
Unfortunately, this product seemed to irritate my skin, causing acne breakouts whenever I used it. I had to give up on it... I don't think I'm generally sensitive to niacinamide, but for some reason, this particular product really upset my skin.

마멞2
Dec 1, 2024
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
It's ambiguous. I bought it expecting to see a reduction in blemishes, but the effect on my chin acne is inconclusive...
Cons
This product causes breakouts on my forehead, but not on other areas. I wonder why that is?

곔영
Nov 18, 2024
Normal 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
There is absolutely nothing. It's the worst. I wrote this and my face turned upside down.
Cons
After using this, it turned over and severe inflammatory acne came up from the inside of my skin. It seems that other people have experienced the same thing.

전통적인유리나비3206
Sep 4, 2024
Combination 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
Although it hasn't been long since I started using it, I think it's okay to just use it.
Cons
I'm not sure if it's because my skin around my nose is sensitive, but when I applied it, that area felt irritated..

빞비
Aug 24, 2024
Combination 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 formula had good potency and the dropper allowed for easy application of small amounts. While it felt slightly oily on the back of my hand, it absorbed into my face without any heaviness.
Cons
I found this product to be a bit irritating and reddening... even on a good skin day. I didn't experience this with a competitor's 5% formula, so I wonder if I applied it too heavily. It's not severe, and calms down after using a face mask, but I still haven't gotten used to the sensation.

속건조나다
Jul 8, 2024
Combination 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 has a nice glide. It's not heavy and absorbs well, so it seems suitable for using as a day care product.
Cons
Milia popped up on my forehead. The cheek area was fine, but it came up on the thin-skinned areas like it was flipping over, so I had to stop using it immediately. I'm only applying it to the cheek and nose area now.

체리림
Jun 14, 2024
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
The CosRX Peptide Booster is good This product seems to have no good points ㅠ.ㅠ
Cons
Usually, before using a new product, I test it on my neck for a few days and then on one part of my face for a few more days before applying it to my entire face. However, I wanted to use this product quickly and feel the effects, so I skipped the neck test and applied it only around my mouth. Then I got a pimple bomb ㅠㅠ From cystic acne to whiteheads, they just keep popping up one by one. I haven't used anything else new, and the acne is only on the area where I applied this product, so I can only think it's because of this product..I've been suffering for two months now, and the acne is getting so severe that I'm afraid to try it again around my mouth....
Tip
I strongly recommend testing on an extremely small area!

등대나무
Jun 6, 2024
Dry SkinSensitive Skin
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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 bought a 15% niacinamide product after seeing good whitening effects from a 10% product from another brand. I really like the gentle ingredients and the packaging that helps prevent oxidation. The application and absorption are also quite good. It took me a while to get used to the high concentration, and I haven't seen major effects yet, but my overall skin texture has become smoother and some pigmentation has lightened a bit.
Cons
The 15% concentration was quite irritating for my slightly sensitive skin. Since I was already used to the 10%, I applied it directly to my face and was surprised by how stinging it felt.
Tip
For first-time users, it's best to do a patch test and build up tolerance gradually. I've been mixing 1-2 drops into my Ceracolla cream to help my skin adjust.

소듕한피부
Jun 6, 2024
Dry 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 easy to use, right? Actually, this is the first time I've used such a high-performance product, so I'm not sure.
Cons
Oh yeah, my face is turned upside down. I usually just use serums and lotions, but since they said it's good for improving skin texture, I bought this product and applied it for two days in a row (only at night). A feast of closed comedones and inflammatory acne has begun. I used to get inflammatory acne occasionally when I went to bed late, but I almost never got closed comedones. I guess closed comedones are this itchy and stinging. I just squeezed the serum out of the dropper and spread it all over my face, but it seems like just randomly applying it like that is not the right way. Should I only apply it to the problem areas? I'm not sure how to use it. It was stinging when it got in my eyes, but other than that, my skin didn't feel particularly irritated. But it seems like my skin just doesn't agree with this product. Is it because this is the first high-performance product I've used? Anyway, those of you who are using this product for the first time, please be careful when using it. I think the application method might be the problem, so I'll try applying it only to the problem areas in small amounts once the acne has calmed down.
Tip
It might be a good idea to test it out by applying it only to the problem areas.

Leah830
May 14, 2024
Dry SkinSensitive 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 was pleased with the CosRx vitamin line, so I decided to place an order.
Cons
The results weren't as noticeable as I had hoped, and I ended up getting some pimples on my face.