COSRX

The Niacinamide 15 Serum

64 Reviews

• 하이하링

  Jun 27, 2025 (UTC)
  수부지Acne Skin
  Review under verification

  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

  As someone with combination dehydrated skin, I loved how this product left my skin feeling fresh and matte without any oiliness. I used it consistently morning and evening, and I definitely noticed a reduction in blemishes and a more refined appearance around my pores. My overall complexion became clearer, and it balanced my skin's oil production perfectly, making it an ideal daily serum for summer. The lightweight water serum formula pairs well with other skincare products and absorbs well without pilling, even under makeup!

  Cons

  Given its high 15% concentration, it might be a bit irritating for those with super sensitive skin if used daily from the start. On days when my skin felt more sensitive, I experienced a slight tingling sensation, but it wasn't a major issue when I adjusted the amount used.

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• 례랑

  Jun 5, 2025 (UTC)
  Combination 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

  I've been struggling with various skin issues like dark spots, enlarged pores, and more, but I'm really satisfied with this product. Some functional skincare can be drying, but not this one - which is great. I'm quite impatient, so I love that I can apply my moisturizer right after using this without any pilling. It absorbs well into my skin.

  Cons

  I don't have any complaints yet. If I encounter any issues after continued use, I'll be sure to update my review!

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• 친근한꼬까도요55167

  May 31, 2025 (UTC)
  Combination 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

  I felt this product truly embodies the benefits of niacinamide. My blemishes have decreased, and my pores seem to have shrunk a bit. I'm not sure about the brightening effects though.

  Cons

  My skin became a bit dry. It was fine for my combination skin, but those with dry or normal skin types might need to use it with caution.

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• 김구두

  Apr 3, 2025 (UTC)
  수부지

  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

  For combination dehydrated skin, with T-zone pores and excess sebum issues I bought this because I generally like COSRX products Niacinamide > Controls excess sebum > Pore management - Provides adequate hydration (slightly rich texture, not completely watery) - Fully recyclable packaging - Suitable for daily pore care

  Cons

  - Used almost the entire bottle but no noticeable changes - Feels like a product for subtle daily maintenance - Expected more from the high concentration of niacinamide, but results are uncertain - Not sure about repurchasing

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• 눈쑥

  Apr 1, 2025 (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've been using this product regularly, and I love how it seems to tighten my pores overnight! It also gives me a nice glow.

  Cons

  I've been applying it consistently and so far I have no complaints. It's great!

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• minjoo@

  Feb 8, 2025 (UTC)
  Oily 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

  My skin has improved so much since I started using this...!!! It seems to be really effective for pores and sebum control.

  Cons

  It's a bit sticky, so it's hard to use in the morning..!! I only used it at night.

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• 쥬중잉

  Dec 11, 2024 (UTC)
  Normal 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

  Excellent for pore reduction! This pore-minimizing ampoule effectively tightens enlarged pores. Complexion improvement! After consistently applying it morning and night for about 2 weeks, I was amazed to notice my skin looking inexplicably brighter! I was truly astonished. Skin texture improvement! Using it on my skin that had many bumps and blemishes, it smoothed out the uneven texture, resulting in silky-soft, reborn skin! Especially when applied before bed, I'm astounded by how incredibly smooth my skin feels during my morning cleanse.

  Cons

  Potential for skin irritation! I felt an inexplicable tingling sensation while using it. However, the pore-minimizing effect was exceptional despite the tingling. When irritation occurred, I temporarily stopped use and resumed later without major issues. Small size: While the value for money isn't bad, I loved it so much that I used it frequently and finished it in just a month, which was a bit disappointing.

  Tip

  It's recommended to start with small amounts rather than applying too much at once! The quantity is limited, and using too much might cause skin reactions, so it's advisable to apply it every other day.

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• 양감옹

  Dec 1, 2024 (UTC)
  Oily 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 texture might feel slightly oily at first, but you'll notice it's not really that rich after a while. You can definitely see a reduction in sebum production. With less oil, it seems to be effective for improving pores as well.

  Cons

  It can cause irritation when applied to sensitive areas. It's best to use only on non-sensitive parts of your face. Also, avoid using it on dry areas. The amount seems a bit too small.

  Tip

  If your skin is resilient, combining this with other active ingredients could enhance its effectiveness. It pairs well with the First Serum from the same line.

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• 모라니모

  Dec 1, 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 was hesitant to use niacinamide due to concerns about irritation, but now I'm wondering why I didn't start sooner. It caused no irritation for me and I saw great results in controlling pores and sebum. I only applied it at night for my nighttime routine, and when I woke up in the morning, my skin felt smooth and looked fantastic. Even a small amount was highly effective. I think it could be used year-round.

  Cons

  If I had to point out one disappointment, it would be that you can't see the product inside. Couldn't they have made the container even slightly transparent?

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• 꼬물여물

  Nov 24, 2024 (UTC)
  Dry SkinSensitive SkinAcne Skinproduct.Atopy 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 bought this product because it's supposed to be effective for controlling pores and sebum. Despite its high concentration, I was pleasantly surprised by how gentle it was on my skin. It's a bit on the drying side, which makes it perfect for managing oily skin during the summer months. The clean and simple packaging was an added bonus that I really appreciated.

  Cons

  I didn't have any major complaints while using this product. If I had to nitpick, I'd say the quantity is a bit on the smaller side, which is slightly disappointing.

  Tip

  When you have wounds or blemishes on your skin, you might feel a slight irritation, so it's best to avoid applying the product to those areas.

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