"I have always had really dark circles between my eyes and under them (thanks to my father's side of the family!) and this product is the only thing that works to cover them. I've used it for years. All the other dozens of products I have tried over the years are thin and greasy and disappear in minutes. Last year I noticed it was getting harder to find in the stores so I have started buying 3-4 at a time through Dermstore and it is so convenient. They last a long time but I keep one in my purse, one in with makeup, one at desk, etc. Like I said, "serious" dark circles. I use it once or twice a day when refreshing lipstick or makeup. I give it 5 stars or 2 thumbs up."