This is a highly concentrated serum as you can see, containing Niacinamide 20% + Zinc PCA 1%. How strong is that? But, don't worry, this serum is gentle.
I have oily-sensitive skin and actually when I use a niacinamide serum it's mostly at 5%, sometimes my skin feels sore, tingling which I hate. Of course I was shocked and worried by this serum, very high 20% niacinamide. Surprisingly, this serum is much better and even gentler than the 5% niacinamide I used before!
My skin has very prominent pores that get clogged up and congested easily. After using this for the past week, I’ve noticed my sebacious filaments are completely clean and the pores on my t-zone are far less prominent.
I experienced slight irritation at first, but my skin got used to this product pretty quickly. I think you need to layer this serum with a moisturizing product. It's better if you combine it with HA water plumping serum, I suggest you use both. When I use this serum in the morning, I get far less oily.