I have oily, super-sensitive skin and can't use the Ultra-Light Super Antioxidant Concentrate Serum as it contains Niacinamide. My skin won't tolerate it. This product doesn't contain it and works great. As PC advisors have said, this is super concentrated and you only need a few drops. I use 1 small drop on my forehead area, then use 2 small drops on my lower face (cheeks, nose, eyes), plus an additional small drop on my neck. With my oily skin, it goes on kind of thick but just give it 5-10 minutes to soak in and it's like it was never there. I'm a guy, and honestly, my sensitive skin turns slightly red when I first apply it, however it does that just from washing it. After the 5-10 minute period my skin is back to normal (with the Ultra-Light it was red all day). The best part is when I wake up in the morning, my skin is very soothed and refreshed.