Yes, you can cover your dark under-eye circles with makeup — or you can take it a step further by using a product that actively works to reduce that darkness. Try Kiehl's Clearly Corrective Dark Circle Perfector ($38) to do that job. The formulation is super sheer and dries to a powder-light, crease-free finish that instantly brightens that telltale blue/gray hue. Meanwhile, a powerful duo of activated vitamin C and licorice root extract join forces to correct the darkness so you have to use less and less over time. This one gets bonus points for having an SPF 30, too.