I ended up being very impressed with this serum as well. The consistency is very thin and watery, and only 3-4 drops are needed for the entire face, making this a very budget-friendly vitamin C option. It spreads and absorbs so nicely without leaving any stickiness or oiliness. I'd honestly use this one during the day too because of how lightweight and invisible it is on my skin. It hasn't caused any irritation or flaking, and has done an incredible job of drastically fading hyperpigmentation in just a couple of days.