I find that one squirt is more than enough to cover my whole face and neck. My skin has been very oily lately, but I might have been so before I started using this product, so I am not sure. It's not a wonder product - the $100 anti-aging serums probably work better, but overall I HAVE noticed an improvement in my skin. Although I still do have some deeper white heads around my chin and jawline and light black heads on my nose and center of chin, they have definitely become less noticeable than before I started using this. I began noticing the difference after about 2 weeks. I do use a moisturizer as the bottle says 5 minutes after applying the serum. I do this not because it makes my skin feel dry but in an effort to cut down on the oil production.