Lack of vitamins like Vitamin K, Vitamin B12 mainly causes dark circles. Vitamin deficiency is caused due to improper diet. Diet should be balanced to get rid of dark circles; you should have plenty of water, fruits, green leafy vegetables especially kale, cabbage, and spinach. Proper sleep is necessary for a human being and one more thing is that always prefer natural beauty products. I always prefer organic products of Kaiame Naturals.