I have a lot of baby hair on my face and it tends to build up sebum and make my pore bigger. I also have very sensitive skin and lots of redness around my cheeks. I do see a noticeable different when using this serum. I don't really get any tingling sensation which is a plus because of my sensitiveness, mostly to fragrance or alcohol and some certain essential oils. Definitely no irritation. My skin texture has improved. I use this at night and the whitening essence in the morning. Love this combination. Really work well for my skin. LOVE LOVE LOVE