Ethylene oxide is chemical compound that is discovered at the begining of 20th century and, since that, its application started spreading, but the main application it found in low-temperature sterilisation process that is used for sterilisation of medical equipment, farmaceutical materials and food products. At the half of 20th century, people found out that this compound is not so safe for human health, so health organisations started exercise control of concentrations of ethylene oxide in raw materials that were sterilised with this compund. Numerous scientific researchs indicate that ethylene oxide has carcinogenic and mutagenic impact, and also is considered as reproductive toxic agent. That is the reason why so many people are concerned about using ethylene oxide as sterilisation agent. Research, that is conducted on the Institute for drug analysis and control on Faculty of Pharmacy and Medical Biochemistry of the University of Zagreb, is based on the analysis of 53 different samples of dietary supplements that are found in Europe and in the rest of the world. Results of the research are, unfortunately, devastating because there were more than a half of 53 samples that had detectabile ethylene oxide concentrations in their composition. 8 of them had ethylene oxide concentrations that are more than allowed in the European Union (0.1mg/kg). Furthermore, 2 of the samples had ethylene oxide concentrations that were 30 times more than allowed in the EU. The purpose of tihs research is to indicate to the regulatory authorities of the EU and the rest of the world that ethylene oxide is very toxic compound and that there should be stricter surveillance of pharmaceutical, textile, food and other materials that pass through ethylene oxide sterilisation process.