Over 7.5% of consumers experience adverse effects when using dietary supplements. Therefore, one should consider introducing a vigilance system to trace for side effects of supplements! Such conclusions stems from the study presented in the doctoral dissertation, by Jakub Dorożyński. Today a public defense of his work, created under the supervision of prof. Przemysław Kardas, took place. The results of the defense was positive, of course! Congratulations for freshly baked PhD!