Well, yes, in my opinion, coconut oil can be good for dark circles under your eyes. So you can just have some coconut oil on your eyes, and just repeat it for several days. And it can be effective. Also, there are some other ways which can be used too. For example, you can try some glycerin which is rich in many nutrients so that it can do a good job to reduce the dark circles. Also, some Vaseline contains vitamin E and C, will make your skin sticky. And then it will also helpful in reducing the dark circles. By the way, I have to remind you that lemon juice, olive oil can be good for your eyes. Of course, you need to have a good rest, and stress should be avoided.