Dark circles under the eyes can appear for a number of reasons, and vitamin C eye creams may not effectively treat some of them, experts say. However, brands often market ingredients like vitamin C and vitamin K – which consumers recognize – as ingredients to treat dark circles, according to Roberts-Smith. These skin lightening ingredients are best for true hyperpigmentation caused by dermatitis. Inflammation near the eyes can happen for a number of reasons like repeated exposure to the sun, untreated allergies, or rubbing your eyes too hard. Some also have a genetic predisposition to hyperpigmentation under the eyes and in that case a vitamin C eye cream may not provide visible results.