I bought this serum because I want to lighten my post acne spot, the skin health and texture in general. The serum has a dropper, but my it was not a good one as it could only hold 1/3 product of its length. Most of the time I need to squeeze it twice. The serum is pretty light, and absorbs quickly into the skin, a little bit sticky afterwards but I personally don't mind that at all. I could use it under makeup just fine. I have been using it everyday twice a day for about a month by now and I have 1/4 of the serum left. I would say a bottle can last nearly two months if it's used moderately, and a month if super generously. Unfortunately, I don't think it did anything to my skin (but it didn't break me out either). It was nice to try at least since it was quite affordable!