Well, yes, olive oil can be good for dark circles under your eyes. First, you should know that when your eyes muscle is stressed, it is possible to have wrinkles and dark circles under eyes. And at this time, you can try some ways to treat it. For example, you can just apply olive oil, which is effective to treat it. According to some researches, olive oil is rich in vitamins, and also, it has some healing properties that will help not only to reduce swelling, but also help to dark circles. By the way, for dark circles, you also need to pay more attention to lack of sleep, stress, and also many other factors. Anyway, just have a try, and it can be effective.