Dietary supplements are various types of food products whose function is to supplement our basic diet. They are a source of vitamins and minerals. They are available not only in pharmacies, but also in other shops. Many patients do not know what dosage of supplements they can take. This can lead to overdosing. In view of this, attempts are being made to register dietary supplements. It will become necessary to consider the safe upper level of their intake, to assess the risks of taking them and also the impact on the whole human body. Let us remember that a dietary supplement is not a medicine! we should nevertheless take it according to the indications on the packaging or leaflet.