According to the story from Goethe University Frankfort, the researchers tested 18 different bottled water products in an effort to look for endocrine disrupting chemicals, or EDCs. They found far more than expected, identifying 24,520 different chemicals in their testing. After isolating the chemicals and determining their impact on the body, the researchers narrowed down those with anti-estrogenic properties to one: DEHF or di(2-ethylhexyl) fumarate. This finding was of major concern.