Vitamin and mineral supplements play an important part in decreasing the risk of nutritional deficiencies in human organisms, as well as in lowering the risk of specific chronic diseases. On the other hand, it is a crucial issue to ensure the necessary food health safety for consumers in the sense of volumes of the doses to be consumed. In this paper, there are discussed rules of marketing vitamins and minerals in the form of food products known as dietary supplements, with special emphasis put on the determination of maximum dose amounts of these nutrients in daily doses of supplements. In addition, some useful guidelines are presented to be observed when practically recommending dietary supplements.