COSRX The Niacinamide 15 Serum Reviews

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

4.59

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5 Reviews

비인짜앙
Mar 22, 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
I have combination dehydrated skin prone to blemishes! My skin hasn't improved since my student days... I've been using niacinamide for quite a while, but its characteristic stickiness was so intense that I found myself avoiding it. As I used it less and less, my skin suddenly flared up, making me seriously consider seeking help from a dermatologist. With moving and changing jobs, my skin kept acting up as my overall condition declined, so I completely revamped my skincare routine! This product, which I purchased during that overhaul, absorbs so quickly that at first I wondered if I'd even applied it. It leaves a slightly oily residue. Due to the nature of niacinamide, it can sting quite a bit on sensitive areas or open wounds. However, with consistent use, it helps regulate sebum production and reduces texture! Even though the price makes me wince a bit, it's become a repurchase-worthy magic potion. This broke girl is... Following this routine: toner > niacinamide > bakuchiol serum > mist > cream, I've noticed my skin improving significantly, and even old scars seem to be fading bit by bit.
Cons
For first-time users, you might experience some deep dryness if you only use this product! It would be great to use it with hydrating toners and emulsions or creams before and after, but I'd recommend layering a cream toner containing ceramides 2-3 times, then finishing with an ampoule, emulsion, or cream. There is a slight oily residue left behind! If you're worried about your makeup pilling, apply an appropriate amount and gently blot with oil-absorbing sheets.

Sejeong04
Aug 31, 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
It seemed like the troubled skin was calming down, and it also seems to be good for the acne scars.
Cons
It's really disappointing that the volume is small, and after applying it, the product doesn't fully absorb into the skin and leaves a slightly slippery feeling on the surface.

포르쉐타이칸
Jul 3, 2024
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
The formula is watery, but has a slight viscosity, so it's good to use even in the summer. As an oily skin type, it doesn't feel burdensome to use in the summer. I didn't get along with the niacinamide product from Ordinary as it was a bit stinging, but this one doesn't have that issue and it calms my skin without causing any breakouts.
Cons
It's a bit slippery like a water-based serum, so you only need to apply it once, not two or three times.

음슴체씁니다
Jun 11, 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 skin type is dry and sensitive. As I entered my 30s, my skin has gradually become drier and more sensitive. In my 20s, I didn't manage my skin well, so there were some blemishes and acne scars. As the day of the great nature approaches, acne (mainly on the chin) appears on my skin. 1. High-concentration niacinamide that can be applied morning and evening It's not easy to find a product with such a high concentration of niacinamide, which is known as a versatile ingredient. And it's great that it doesn't require special timing or storage like vitamin C or retinol. Since I knew this ingredient worked well for me, I could really feel its effectiveness. 2. A watery, non-sticky formula My skin is progressing towards dryness, but I can't stand stickiness or greasiness. I'm quite sensitive to texture, so I'm obsessed with non-sticky, slime-like textures, and even the slightest unpleasant feel on my pillow or clothes bothers me. That's why I usually try a product once and then give it away if the formula isn't light and unobtrusive. This serum is truly so watery that it's just perfect for me. When I first apply it, it just flows smoothly onto the skin, and when I roll it in, it feels like it's being absorbed into the skin with a "shlurp shlurp" sound. It's refreshing yet nourishing, and I'm satisfied that there's no strong residue left after absorption.
Cons
1. Due to the high concentration, there is a sense of irritation when the skin condition is sensitive and prone to irritation. While it is momentary, there is a burning sensation. Especially after popping a pimple, even after some time has passed, there is a stinging feeling when applying this product compared to others. 2. It is certainly not focused on hydration and moisture, so if this is used alone, it can lead to dryness. Especially when used with retinol, if additional moisturizing is not done, the T-zone of oily skin types will produce more oil, and the cheeks will feel dry with noticeable flakiness, so moisturizing is essential.
Tip
1. This is like a cheat code when used together with retinol! For those who can tolerate retinol, using this along with it helps to tackle pores and blemishes for real. 2. When you feel a stinging sensation after applying this, just put on the pad with lots of centella and leave it on for about 3 minutes, and the irritation will subside. The combination of the two is also great.

mill2020
Dec 19, 2023
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
I purchased this niacinamide serum after hearing that it is effective in preventing blemishes, and have been using it diligently every evening for about two months. To be honest, I'm not sure if the effects are as dramatic as claimed. Even while using this serum, I still experienced some breakouts. However, the duration of these inflammatory blemishes was significantly shorter compared to before. The most noticeable effect was on my cystic acne - I did not develop any painful, hard, and inflamed cystic acne during the time I was using this serum, though I'm not sure if it was just a coincidence. Rather than thinking of this serum as a perfect blemish solution, I feel it serves more as a supplementary product that can provide some preventative benefits with consistent use. While the effects are not incredibly dramatic, there are still some benefits, and given niacinamide's properties in terms of blemish prevention, sebum control, and pore improvement, I would like to finish at least one more bottle to see how it works for me. I've been layering this serum with the Numbers glutathione serum during the day and this serum at night, and I've noticed a significant brightening of my complexion. People have even asked me if I'm wearing a color-correcting cream, when I've only applied my mineral sunscreen.
Cons
The finish has a slightly oily feel to it. It's not sticky, but there is a slippery, almost 'coated in oil' sensation. Personally, I didn't find it drying, but I can see how this texture might be a hit-or-miss for some.