I looked around to see if I could find a citation for how much selenium Dr. Olree takes. None so far. But I ran across this nifty pdf of an interview of Dr. Olree talking about magnesium, iodine, selenium, boron, and yttrium. A nice refresher of stuff we've talked about.
http://www.acresusa.com/toolbox/reprints/Oct05_Olree.pdf
"In the Beginning Was the Gene: Tracking Down the Roles of Trace Nutrients"