I guess I am one of the lucky ones. I use it every night and then only a regenerative cream, and the next day I have fewer pores, a plump effect, and generally a healthy glow. Pimples and marks didn’t go away as I thought, but at least my skin accepted the percentage of niacinamide. Those who have read know: results come cumulatively and slowly and depend on persistence. Nothing works miracles at a certain age after some years. I will try with azelaic acid, as they say these two work wonderfully together. At noon I use argireline and matrixyl, which should also bring some results. Attention! No skin is the same. For example, I cannot tolerate retinol and hyaluronic acid, which is such a good ingredient, I just can’t handle it. Conclusion: try niacinamide, yes it helps some people and for others it does nothing or causes irritation. Take it easy at first.

I have been using it daily for two months now and unfortunately I haven't seen any difference in my pores. I will continue using it until it runs out, hoping that with more prolonged use, I might see results.

I have been using it every night for 6 months! I have very oily skin, so it didn’t bother me at all, nor did it make my skin drier. On the contrary, it helped me a lot in regulating oiliness. Additionally, it helps a lot with pimples; as soon as I apply it, they shrink immediately. Unfortunately, it didn’t help much with the redness I have, nor did I see any difference in pores.

My skin immediately after application is smooth and with no sign of oiliness. I am a person with acne and this particular product, combined with other products from The Ordinary, has saved my face

Because I noticed some negative comments, it would be good to first do some research on how niacinamide is used before buying it, with which products it can be combined, with which not, and in what order. Also, you will not see results with 1-2 uses, but after weeks. Gradual use on the skin is recommended until it gets used to it. And always, before using any product on your face, do a patch test. That is, try a small amount on your hand and if you do not notice any worrying reaction such as allergies, etc., then try it on your face.

I have dry skin and it didn't suit me at all, on the contrary, it made my skin feel even thirstier, so it's not suitable for all skin types as stated in the description.
I should also mention that I applied it after washing, before moisturizer, and it usually pilled. You only need a small amount.

It leaves shine on the skin. I use it at night and in the morning when I wake up, especially on my forehead, I have full shine

I got it for controlling oiliness on my skin and for a few small dark spots, as I read that niacinamide helps. Unfortunately, it did absolutely nothing for either issue. Its texture is a bit sticky at first and then dries out. To the point that it made my skin feel tight. You definitely need to moisturize afterwards to balance out this feeling. In short, it didn't cause me any problems, but out of all the serums I've tried, this one was like I hadn't applied anything at all. No hydration, no glow, the dark spots remained untouched, and the oiliness stayed the same. And this was during the winter months, when these issues are milder anyway.

Indifferent to annoying smell, its texture is a bit sticky. I don't feel any change on the skin and I think it even dries it out a bit

I got it mainly for reducing imperfections and discolorations... I have combination skin with areas of hyperpigmentation. The first few days it was fine, I applied it at night before my moisturizer and it seemed to suit me. But in two spots it caused small pimples and a bit of dryness, so I stopped using it because maybe the 10% was too much for my skin, plus I wasn't using just 2 drops but a bit more, so I think it was too much for me. Maybe in the future I'll use 1 drop in my moisturizer at night.
Generally, niacinamide needs caution as I read later. You have to see what percentage is tolerable for your skin... usually 2%-4% is easily tolerated and gives results. At least for skin like mine.

I think it does absolutely nothing. You feel a slight hydration when you apply it but after a while the skin is dry. The manufacturer does not promise anything so I can't say that it doesn't do what it claims, since it doesn't claim to do anything. But I had read that this formula helps balance oil production on the face and helps a bit with acne. However, I did not notice any effect after many months of use.

First time using a serum, it definitely needs a moisturizer because it pulls the skin, but I think it works

Full oily skin here with a tendency to acne, I use it every night with cleanser and Vichy Normaderm cream. It dries my face a lot, I have also tried toner in between, still dries out. I can't say it's annoying but I don't think it would work for someone with less oily skin. It dries out pimples I might get faster. And while I used to wake up in the morning always fully oily, now it's very normal, to the point where I can go out like that without washing my face again. I will buy it again.

After 1-2 months of use, I think it does something, but not anything amazing for the skin. You definitely need a moisturizer afterwards, otherwise the skin feels tight.

It is the best thing I have used in skin care. I will say it simply and clearly, I have been struggling with pimples, blemishes, redness, and breakouts for years now. You know well that apart from facial products, all doctors say to drink water, lose weight, don't stress in your life, blah blah blah, but that's not always possible and I was looking for a product to do the job on my face before I become zen myself and THIS IS THE PRODUCT. Breakouts have decreased, my face is almost spotless after years, pimples don't appear and if they do, they disappear in a day. I use the product at least once a day and I will continue to use it forever. I AM SAVED. I will buy it again and again, I love it and I highly recommend it.

I have never seen such results with any other product... I applied it at night before going to bed and in the morning I saw a different face, radiant and without pimples... I loved it

It makes the skin glow! I use it 1-2 times a week and the result is wonderful. My skin is sensitive, nevertheless, it did not cause me any irritation. I recommend it, especially for blemishes.

It has no fragrance, did not cause irritation. You can use it in the morning, you can use it at night, it has a nice feel and does not cause dryness to the skin. Overall, it helped a lot with controlling sebum production, some areas with hyperpigmentation have improved and it did something with the pores, but not miracles. It also helped a lot with marks from pimples (the red ones that remain after some pimples).
It is a very good product that can be combined with salicylic acid or retinoids in your routine and have excellent results.

it's amazing as a product and it has very noticeable results within a week, but it does feel a bit sticky when you put it on

One month of use and I will say that my face is brighter and clearer than ever. I have never seen it like this in my life before..
It's like I'm wearing makeup all the time.
UN-BE-LIEV-ABLE product! Of course I will buy again.
I combine it with cerave moisturizer, and it's supeeeer
Congratulations!!!
(If it stings you at some point, maybe the concentration on your skin is too high, use it every 2 or 3 days and it's perfect!!)

I use it for my night routine. It is the only product where I saw a real difference with my pimples. I got it for anti-aging prevention (which makes the skin elastic, and it really does) but I have also seen a difference with the mild acne pimples I have. I will definitely buy it again, it's worth it!

I apply it every morning before moisturizer and sunscreen! And once a week I also use it at night! I have comedonal acne and I can say that it cleans the pores so the condition improves!

It has an effect from the very first uses when combined with other products from the company. I have oily, sensitive skin and for a week now I have had no irritation.

It gave me small red pimples, but maybe I didn't use it correctly. It's not a product that you just put on your face

I didn't see any difference in the pores. However, the redness has decreased and my face looks more even

Very good product! I have been using it for 2 weeks and I have already seen a difference in the red marks left by acne.

It helped me with a few marks on my face as well as with 2 dark spots after pregnancy. My face became more radiant and achieved a more even tone. I also noticed a difference in a few pores that were slightly enlarged. I was very satisfied, of course, this worked on my skin, in someone else's it may not have the same results

Personally, I have found that Niacinamide worsens my cystic acne. I avoid foods that irritate my acne and use specific products that are confirmed not to make it worse. By trying various products and observing my skin's reactions, I have noticed that any cream I have used that contains Niacinamide always worsened the acne

Glow and skin tone improvement from the first uses. I expect to see if it also works on pores. I don't have an opinion yet about the pimples.

I started it because of dark spots after the summer and in combination with the regenerating cream from Sostar - I am amazed by the quality of their products, it has changed my skin. Absorption is not as difficult as I read, and after all, the result is what matters!