As for fat-soluble vitamins, we generally hear, the organism is capable of storing them, so they may have harmful effects and toxic symptoms in the case of excessive intakes. It is naturally true, but to be more precise, there is a considerable difference between the daily requirement and the toxic dose. In fact, with a little attention, the risk of overdose of vitamins can be minimised. Before going on to providing information about the particular vitamins, one more thing needs to be noted: previously the quantity of fat-soluble vitamins was traditionally provided in International Unit (NE in Hungarian). It resulted in misunderstandings of various degrees, because different values in the cases of vitamins were considered as 1 IU. For example, while 0.3 microgram (µg) equals 1 IU from Vitamin A, 1 IU is 0.025 µg from Vitamin D, and 1 mg from Vitamin E (mg).