COSRX The Niacinamide 15 Serum Reviews

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

4.59

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99 Reviews

똥쟁이열무
Apr 30, 2025
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
This is my go-to night routine product. It's absolutely amazing and a must-have. You can really feel the difference when you wake up in the morning.
Cons
Be very careful when applying to sensitive areas as it can cause intense tingling. It's best to use after your skin has calmed down.

밍구미에오
Apr 17, 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
It really brightens up your face. I've heard many people say their skin looks noticeably lighter after using this.
Cons
It can be a bit harsh on the skin. There's a slight tingling sensation, so don't apply too much.
Tip
It's best to apply this at night.

가벼운흰뺨오리
Apr 16, 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'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.

1J
Apr 5, 2025
Normal SkinSensitive 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
My sudden outbreak of tiny blemishes dramatically reduced and then disappeared. They haven't really come back since.
Cons
I'm not sure if it's effective on skin marks. Also, it occasionally causes a tingling sensation, so caution might be needed when using it.

고고링
Apr 3, 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
After consistent use, I've noticed it definitely helps control oiliness. This would be great to use in summer! Seeing the powder around the opening suggests it has a high concentration of active ingredients. It seems to slightly even out my complexion too, so I'm planning to keep using it regularly!
Cons
When I first started using it, it stung a bit, perhaps because my skin wasn't used to it. It got better after a few uses, but for those with super sensitive skin, I strongly recommend doing a patch test before full application.

밥은먹냐
Mar 19, 2025
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.
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
Hello there, beauty junkie here! Personally, I find myself bulk-buying niacinamide products. It's partly because they often come in small quantities, but mainly because this serum has shown me some truly impressive results. I highly recommend it!
Cons
Just a heads up for first-time users: you might experience a slight tingling sensation. Keep that in mind when trying it out.

아따좋다
Mar 6, 2025
Dry 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
This is just a regular item that I keep purchasing and using, but when you actually use it, your skin doesn't just become brighter or clearer - it becomes truly transparent. Right after washing your face, you get that momentary clarity, and that's exactly the feeling of your skin becoming whiter.
Cons
Be careful with excessive scrubbing on sensitive skin days or when you have blemishes.
Tip
Using it as a serum substitute actually dries out the skin ㅜ If you're going to use the niacinamide ingredient, be sure to use it with a moisturizing serum ㄱㄱㄱ

크라이스
Mar 2, 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
The skin texture becomes more radiant while maintaining a certain degree of moisturization. Highly recommended! Satisfactory in terms of value for money.
Cons
Aside from applying it little by little on the bottle cap, there's nothing else. If your skin is sensitive, it may sting, so avoid it.
Tip
If you desire a greater effect, try applying retinol or vitamin C together!

감쟈옥수슈
Mar 1, 2025
Combination 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.
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
After use, my skin felt like the oil had decreased.
Cons
My skin was very irritated when it came into contact with the wound due to skin troubles. The troubles did not seem to decrease, and the troubles did not appear to have any effect.

결결두가각
Feb 28, 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
For a little over 2 months, I've been using one bottle and have purchased and used another. Before, if I missed my cleansing routine, my skin would become extremely oily, and touching my face would leave my hands feeling sticky. But after using it consistently, the oil control has improved, and my skin tone has become much brighter. Now that my skin has become dry, I've been able to apply many rich, functional products and have seen various beneficial effects, so I make sure to apply it diligently.
Cons
It stings! I'm not sure if it's because I applied the Leedle Shot, but sensitive people should be aware and purchase it accordingly.