Dietary supplements enrich the daily diet with the primary task of maintaining health. Precisely because of all the benefits they provide to the human body, it is necessary to meet the daily needs of vitamins and minerals, but unfortunately this is increasingly difficult due to the modern way of life and the lack of variety in the routine diet of people. The most common supplements used as food substitutes are vitamins, minerals and plant extracts.Recently, the availability of various preparations from different manufacturers is easier than ever. In addition, the sale of these preparations is accompained by the media in such a way as to stimulate customers to buy them by stating a number of effective effects on health, such as reducing appetite, increasing muscle mass, improving memory and circulation, etc. The mentioned category of preparations is considered as food, therefore the legal regulations are less strict than for medicinal products, which are subject to strict control. Common methods of analysis for food supplements are chromatographic and spectroscopic methods. In this work, X-ray diffraction analysis (XRD) was used on powdered, polycrystalline samples of mineral food supplements in order to determine the effectiveness of the same in supplement analysis.