Over the past two years and a half, my PhD research has involved studying the metabolism of environmental contaminants such as bisphenol A (BPA) and butylated hydroxy-toluene (BHT) and several of their analogs. We are exposed to these types of xenobiotics daily, some of which are known to have harmful effects on human health. Using an untargeted LC-HRMS/MS method, we have been profiling the metabolic products and elucidating their structures, as potential biomarkers of exposure, from in vitro incubations.