OSEI is actually not off base with their accusations. Reports from late 2012 revealed that using oil dispersants like Corexit make oil spills less visible, but when combined with the oil, create a mixture that is 52 times more toxic than the oil itself. The studies revealed that even in small amounts, the combination of oil and Corexit reduced the number of egg hatchings in small marine invertebrates by 50%. These are small creatures like krill, shrimp, and other crustaceans that form the bottom of the oceanic food pyramid.
Those results were just from small doses of the mixture. And as I wrote in 2011, the amount of Corexit dumped into the Gulf was anything but “small”: