How can I treat dark circles under the eyes myself?

Like over-the-counter antidotes for puffy eyes, the plethora of topical eye gels, serums, and creams probably is not going to do much but moisturize (which is not a bad thing; they just would not get rid of dark circles). Most contain kojic acid, a mild skin-lightening agent (which would not do anything if your circles are not a hyperpigmentation problem). Some include vitamin K, which inside the body affects the clotting of the blood. Applied topically, it is supposed to diminish bruising and darkness associated with blood vessels. There is no research to support these claims, and, like many ingredients, it is unlikely to penetrate far enough into the dermis to affect blood vessels in a long-lasting way.