Gave it a try after my The Ordinary Niacinamide finished as that isn't available easily and turns out to expensive in the long run. Okay so. This is a good product. More watery than the ordinary serum so I end up using a lot more and my bottle is on its way to finishing very fast!! (Infact it's triple the rate at which used up the ordinary! As this one is very watery) But does the job. Took a while to show some changes in the skin.. I've been a Niacinamide user for years..and this is a differently formulated than the ordinary serum. I can see the pores look smaller so I will Keep using it. Didn't get a reaction or a breakout with this formula as it's gentle enough. Happy to see a brand sell a simple Niacinamide serum without the extra nonsense or fragrance. And cheaper as well so I don't mind ordering another bottle .. Only issue is. The damn dropper!! I'm in half mind to throw the dropper of this bottle and put in my ordinary dropper. This dropper dsnt get any product in and I need to keep squeezing it!! So annoying. Over all. Happy with the product. Good job Minimalist!