Healthy lifestyle habits such as healthy eating and regular physical activity, which is confirmed by, among others, the increase in the number of gyms and sports clubs, has led to an increased interest in dietary supplements for athletes and physically active people. For example, in 2017, in the United States, these kinds of products constituted 16% of the dietary supplement market (1). These preparations are often used to supplement macro-and micronutrient deficiencies. Regulations concerning dietary supplements provide detailed guidelines only for vitamins and mineral components (2). However, the Food and Drug Administration has created the Dietary Supplement Ingredient Advisory List, which includes the names of dietary supplement ingredients that need to be studied further to ensure their safe use (3). Furthermore, some supplements have been discontinued due to i) heavy metal, pesticide, or microbiological contamination, ii) absence of declared ingredients or iii) the presence of more or less of the ingredients than the amount declared on the label (4). Owing to the scale of distribution of these products and the number of available substances, the issue of ensuring the safe use of dietary supplements constitutes a problem for Poland as well as Europe as a whole. The sole requirement for introducing a dietary supplement to the Polish market is that the entrepreneur must submit a note to the supervisory body ñ the Chief Sanitary Inspectorate. Meeting this formal condition enables the sales of the submitted product. However, unreliable implementation of tasks associated with ANALYSIS