This is an unusual product that is sort of moisturizer booster. I already use some pretty intense serums and moisturizers for my normal to dry skin. Honestly, when I applied this serum after my moisturizer, as instructed, I didn't notice much of a difference, possibly because I already use some serious moisturizers. Directly applied to the skin, it soaks right in without leaving a greasy, sticky feel behind. When I tried it again, this time mixing two drops in with my moisturizer, I did notice a slightly more hydrating feeling to my moisturizer. So that is the way I'll use it from now on, or alternately as a serum under the moisturizer. I do love Mario Badescu products, but don't think I'll replace this serum after it runs out. I gave it a 5 mainly because I really like the texture of the product and ease of application.