I note that the FDA didn't find a problem with food safety (http://www.fda.gov/downloads/Food/RecallsOutbreaksEmergencie...) the Wikipedia page references an unreliable Vice/MotherJones article. Not finding much on its side effects from research though. Do you have some additional pointers?
I was mostly using Google Scholar to look for peer reviewed work with the keywords 'corexit toxicity' There are a about a dozen papers on the first page, of the ones I could read without jumping various firewalls the conclusions tended toward 'less toxic' than 'more toxic'. Would love to see a meta analysis too but didn't dig one up.
There are plenty of links to reliable sources there. Which page were you looking at?