Vitamins of the B group and Vitamin C dissolve in water. Therefore, even if you take excess of these vitamins, they pass out of the body (through urine). But Vitamins A, D and E are not soluble in water. They are soluble in fat or oil. Excess of these vitamins can be harmful. Excess of vitamin A is stored in the liver and it can cause scaling of the skin, nausea, coarsening and loss of hair, pain in the bones, fatigue and drowsiness. Prolonged high intake of vitamin D can result in loss of appetite, fatigue, nausea and vomiting. It can also damage the kidneys.