Impact of selenium supplementation on mood Selenium intake was associated with a general elevation of mood and in particular, a decrease in anxiety. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1873372&dopt=Abstract
Selenium in the The Pharmaceutical Journal Vol 265 No 7110 p252 There are indications that it is important for brain function through its antioxidant activity. Low selenium status may be associated with depression, anxiety, confusion and hostility. Selenium supplementation may improve mood. http://www.pjonline.com/Editorial/20000819/comment/moonelement.html
The argument for increasing selenium intake A number of studies have shown a beneficial effect of Se status on mood, at least when Se status is ‘marginal’. In three separate studies low Se status was associated with significantly greater incidence of depression and other negative mood states such as anxiety, confusion and hostility http://saturn.bids.ac.uk/cgi-bin/ds_deliver/1/u/d/ISIS/14733197.1/cabi/pns/2002/00000061/00000002/art00007/009C41D5608F460E1102231262A0A2A92145D5BA8F.html?link=http://www.ingentaconnect.com/error/delivery&format=html