Martin Wagner and his colleague, Jorg Oehlmann, of Frankfurt's Goethe University, in collaboration with a team of researchers from the German Federal Institute of Hydrology, learned this after tests on 18 bottled waters for the presence of endocrine disrupters. Using a state-of-the-art set of high-resolution biological analysis and mass spectrometry, the team identified 24,520 chemicals in the water tested. But a major concern, and the underlying reason for the study results, was DEHF, a chemical used to make plastic bottles more flexible. According to reports, DEPH has been clearly identified in the tested water as the most consistent and obvious culprit causing antiestrogenic activity. Despite the traces of more than 24,000 other potentially harmful chemicals, DEHF stands out as the only EDC capable of triggering this particular observed action, a very worrying observation. The published summary of the study shows that 13 of the 18 bottled water samples tested showed "significant" antiestrogenic activity, while 16 of the 18 samples inhibit the androgen receptors in the body by an exorbitant 90%.