By eHow Fashion, Style & Personal Care Editor
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Dark circles under the eyes can be caused by a hereditary condition that affects pigmentation or events that cause the capillaries to weaken, such as sun damage, use of birth control or pregnancy, among other things. Vitamin K is commonly found in skin care products to treat dark circles; however, a quality cream will contain elements that both lighten the skin and work to strengthen the capillaries. In order to treat dark circles with vitamin K cream, you must choose a quality cream and use it correctly.
eHow Fashion, Style & Personal Care Editor