COSRX

The Niacinamide 15 Serum

26 Reviews

• ohdhodhuf

  Jun 21, 2025 (UTC)
  수부지Sensitive SkinAcne Skin

  Review under verification

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  OK

  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.

  OK
  Pros

  The product itself is lightweight and absorbs well, making it pleasant to use.

  Cons

  Unfortunately, it didn't suit me. Usually, I only had small blemishes on my cheeks, but after using this, I suddenly developed inflamed acne all over my face, including my forehead where I never had issues before.

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• 잉새앵

  Mar 5, 2025 (UTC)
  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.

  OK

  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.

  OK
  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.

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• 마멞2

  Dec 1, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  It's a bit ambiguous. I bought this hoping it would reduce blemishes, but I can't really tell if it's had any effect on my chin acne...

  Cons

  Whenever I use this alone, I get blemishes on my forehead. I wonder why? The rest of my face seems fine though...

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• 곔영

  Nov 18, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  Absolutely nothing good about it. It's the worst. My face completely broke out after using this.

  Cons

  After using this, my skin went haywire. I developed severe, deep cystic acne that seemed to come from beneath the skin. It looks like other people had similar experiences.

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• 전통적인유리나비3206

  Sep 4, 2024 (UTC)
  Combination 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.

  OK

  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.

  OK
  Pros

  I haven't been using it for long, so I'm not entirely sure, but it seems decent enough to use

  Cons

  I don't know if it's because the skin around my nose is sensitive, but that area stings after application..

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• 빞비

  Aug 24, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  I really liked the container and the dropper that allows for precise application. While it felt slightly oily on the back of my hand, it absorbs effortlessly into the face without feeling heavy.

  Cons

  Unfortunately, this product caused a slight tingling sensation and redness for me... Even on a day when my skin was in good condition. I didn't experience this with other brands' 5% formulas, so I wonder if the concentration might be too high here. It's not severe - the irritation subsides quickly with a mask - but I can't seem to get used to it even with continued use.

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• 속건조나다

  Jul 8, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  It absorbs beautifully. The lightweight formula absorbs well, making it perfect for daytime use.

  Cons

  I developed small bumps on my forehead. While my cheeks were fine, the thinner areas of my skin reacted with blemishes, so I immediately stopped using it. Now I'm only applying it to my cheeks and nose area.

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• 체리림

  Jun 14, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  The COSRX Peptide Booster is great. However, I can't seem to find any positive aspects about this product...

  Cons

  Usually, I test new products on my neck for a few days, then on a small area of my face for a few more days before applying it all over. But with this one, I was eager to see results quickly, so I skipped the neck test and applied it around my mouth area. Big mistake! I got hit with an acne bomb. From pustules to whiteheads, all kinds of blemishes started popping up one after another. Since this was the only new product I used, and the breakouts only appeared where I applied it, I can't help but blame this product. I've been struggling for two months now, and the acne is so severe that I'm scared to try it again. The area around my mouth is a disaster...

  Tip

  I strongly recommend testing on an extremely small area first!

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• 등대나무

  Jun 6, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  After seeing brightening effects from using another brand's 10% niacinamide, I decided to indulge and purchase this one with a higher 15% concentration. I love that it has gentle ingredients and the packaging is designed to prevent oxidation. The absorbs well and absorbs well into the skin. Although it's taking time to adjust to the high concentration and I'm only using a small amount, so I haven't seen significant results yet... Overall, my skin texture seems smoother and my pigmentation appears slightly lighter.

  Cons

  For someone with slightly sensitive skin like me, the 15% concentration was too irritating and caused a lot of tingling. Since I was already used to 10%, I applied it directly to my face and was surprised by the intense burning sensation.

  Tip

  First-time users should definitely do a patch test before applying. I'm gradually adapting by mixing 1-2 drops with my ceramide cream.

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• 소듕한피부

  Jun 6, 2024 (UTC)
  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.

  OK

  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.

  OK
  Pros

  Easy to apply? To be honest, this is my first time using such a high-performance product, so I'm not entirely sure.

  Cons

  Oh boy, my face has completely broken out. I usually have dry skin and only use serum and emulsion, but I bought this product after hearing it was good for improving skin texture. I applied it for two consecutive nights, and my face went haywire. It's like a festival of whiteheads and pustules broke out on my skin. I occasionally get pustules when I stay up late, but I rarely get whiteheads. Now I know how itchy and tingly whiteheads can be. I applied it all over my face like a serum, squeezing it out of the dropper and massaging it in. In hindsight, that probably wasn't the right approach. Should I have only applied it to specific areas? I'm not sure about the proper usage method. While it stung a bit if it got in my eyes during application, I didn't feel any particular irritation on my skin. It seems my skin just doesn't agree with this product. Maybe it's because it's my first time using such a high-performance product? Anyway, first-time users should be cautious when using this. I'm thinking of giving it another try with a small amount on specific areas once these blemishes subside, in case it was just my application method that was the issue. P.S. All the red marks in the photo are blemishes that appeared after using this product. There are some on my chin too, but I was too lazy to take a picture of those. I used to have some dark spots and blemishes, but never acne. Thanks to my adventurous spirit in trying new cosmetics, I've now been blessed with these glorious blemishes.

  Tip

  It might be a good idea to test it by applying only to specific areas.

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