Yep, it does help improve dark circles under the eyes. This essential function of iron is to transport oxygen to the body through the blood. Without it, the skin to look pale and in turn the paleness of the skin would highlight the veins under the eyes. Supplementing your diet with iron would reduce the appearance of dark circles under eyes by speeding up the blood flow and improve your overall health. You could intake iron rich food to improve the dark circles under the eyes. such as leafy vegetables, seaweed, raisins, kidney and among many others. Be careful do not intake more than the daily recommended dose of iron, otherwise, it may lead to iron poisoning.