New results are being published frequently in the scientific literature that continue to broaden the scope of inquiry. No one is exposed to just one chemical . New research examines the nature of interactions among chemicals. Some are additive, some synergistic, some even cancel one another. It turns out that endocrine disrupting chemicals violate a basic assumption of toxicology and modern risk assessment.
Higher doses lead to higher effects.
For some endocrine disrupting chemicals, however, effects may disappear at higher levels, or become different qualitatively.