Multivitamin preparations are popular dietary supplements in Poland, valued for their availability, ease of use and low price. Their composition includes various vitamins and minerals, plant extracts and other supportive substances. It turns out that multivitamins may contain mutually exclusive ingredients, and studies do not show their effect on reducing the risk of death or cancer, for example. They often contain high doses of cheap ingredients that can be supplied from food. If deficiencies are suspected, it is advisable to carry out tests and consult a specialist instead of reaching for multivitamins.