Here is a good source that may provide
more information on the science and studies behind the choline (though its
rather old):
Dietary Reference Intakes for Choline - National Academies of Science Press
Usually too technical for people - but if you have some basic science education its pretty interesting, it has all the information on all the studies and side effects, etc.:
Dietary Reference Intakes for Choline - National Academies of Science Press
http://www.nap.edu/openbook.php?record_id=6015&page=390
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