I have them too (partly genetic).
You could try rutin to strengthen your capillaries (great for bruising, too) but in Chinese medicine, dark circles of the blue/black variety are related to liver "deficiency" and Kidney/adrenal "deficiency" (which basically translates to a combo of adrenal fatigue and some form of anemia and/or blood stagnation). You could also have a food sensitivity that you're unaware of.
http://acupuncturetwincities.com/201...r-eye-circles/
http://www.naturaleyecare.com/diseases.asp?d_num=22
Topically, creams with Hylexin, Vit. K, chrysin and Regu-Age might help. I'm trying out this cream (it's been a few weeks) and I've noticed that my circles are easier to cover w/ concealer than they were before, so that tells me that it's doing something:
http://www.iherb.com/Life-Extension-...-ml/22332?at=0