COSRX The Niacinamide 15 Serum Reviews

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

4.59

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61 Reviews

김구두
Apr 3, 2025
수부지
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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

눈쑥
Apr 1, 2025
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
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!

minjoo@
Feb 8, 2025
Oily 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
This really improved my skin a lot..!!! It seems to be effective on pores and sebum
Cons
It's sticky, so it's difficult to use in the morning..!! I only used it at night

쥬중잉
Dec 11, 2024
Normal 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
✔️ Excellent effect on pore reduction! The pore-reducing functional ampoule tightens the enlarged pores effectively. ✔️ Skin tone improvement! After applying it consistently morning and evening for about 2 weeks, I noticed my skin had a subtle glow, which was a pleasant surprise. ✔️ Skin texture improvement! When I used it on my skin with uneven texture and blemishes, the roughness was smoothed out, and my skin became soft and supple. Especially when I applied it in the evening and woke up the next morning, I was amazed at how smooth my skin had become.
Cons
Potential skin irritation! Although I used it without knowing what it was, I felt a stinging sensation.😢 However, the pore-minimizing effect was excellent, and whenever there was irritation, I temporarily stopped using it and then resumed use without any major issues. ✔️ Petite volume It's not that the cost-effectiveness is bad, but I liked it so much that I used it up in just a month, which is a shame..
Tip
It is recommended to use a small amount gradually rather than applying too much from the beginning! Since using too much can also be risky and cause the skin to flip over, it is advisable to apply it every other day.

양감옹
Dec 1, 2024
Oily 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
The formulation may feel slightly oily at first, but as time goes by, one can notice that it is not overly oily. You can clearly see that sebum production is reduced. As the sebum decreases, it also seems to have an effect on improving pore size.
Cons
Applying it to sensitive areas may cause irritation. It is recommended to use it only on non-sensitive areas. Avoid using it on dry areas as well. The amount seems too little.
Tip
The skin is resilient, and when combined with other functional ingredients, the effects can be further enhanced. It pairs well with the First Serum from the same line.

모라니모
Dec 1, 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
I was hesitant to use niacinamide at first because it was said to be irritating, but I realized I didn't experience any irritation and it was actually quite effective for my pores and sebum control. I only used it as a night treatment, and when I woke up in the morning, my skin felt smooth and looked great. Even a small amount was very effective. It seems suitable for use year-round.
Cons
If the biggest disappointment is that the contents are not visible, then it would be a disappointment. Could you not have made the container slightly transparent...?

꼬물여물
Nov 24, 2024
Dry SkinSensitive SkinAcne Skinproduct.Atopy 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 bought it because it was said to be effective in controlling pores and sebum, and although it has a high concentration, I was pleased that it was less irritating than I had expected. It's a bit drying, so I think it would be perfect for use as a sebum control product in the summer. The packaging is also quite neat, which I liked even more.
Cons
During use, there were no major disappointments. If I had to pick one, it would be that the capacity is a bit small, which is a shame.
Tip
When there are wounds or blemishes on the skin, it can feel a bit irritated, so it's best to avoid using products on that area.

하랑수박
Nov 20, 2024
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
I've already used the third bottle, and niacinamide seems to be working well for me. It feels like my pores are being managed and my skin texture is improving.
Cons
I'm using it very well without any particular regrets. For first-time users, I'd recommend thoroughly testing it, as it's a high-capacity product and may not be suitable if you're sensitive to it.

앙꼬프시케
Oct 15, 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've been using retinol every other evening. I'm not sure if it's because of this product, the retinol, or the cooler weather, but my pores seem to have shrunk a bit and my skin texture has become smoother with a glassy glow. I liked it so much that I stocked up on the duo set when it was on sale.
Cons
I wish the size was larger than 20ml. Could you please make a 50ml version as well? Other than that, I have no complaints. Please have sales more often :)
Tip
I've heard that vitamin C and retinol shouldn't be used together as they can be irritating, so I've been using the retinol only with niacinamide. It's a bit of a hassle, but I'm keeping it refrigerated.

니난논33
Oct 15, 2024
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.
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 pores do contract. It is also satisfactory that it is absorbed immediately without being greasy.
Cons
Is it irritating? Does it cause trouble... Even when I mix it with a drop of moisturizer and use it, it still causes trouble...
Tip
Try applying it to your neck if you have sensitive skin. When doing a modeling pack, you can use it by adding 6 drops and it can be used without any trouble.