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Conclusion to the polo story. A compounding pharmacy mixed up vitamins and electrolytes for sports horses, but they added 5 mg/mL selenium instead of 0.5 mg/mL, which was the lethal mistake. (It does not say what the total dose was).
Selenium Overdose Caused Deaths of Polo Horses
http://scienceblogs.com/grrlscientist/2009/04/selenium_overdose_caused_death.php
For comparison (I looked up), "Centrum Silver" has 55ug Se (0.055 mg), so 5 mg is about 100 tables - most of a bottle.
http://www.centrum.com/product_detail.aspx?productid=CENTRUMSLVR&panel=tablets
Selenium Overdose Caused Deaths of Polo Horses
http://scienceblogs.com/grrlscientist/2009/04/selenium_overdose_caused_death.php
For comparison (I looked up), "Centrum Silver" has 55ug Se (0.055 mg), so 5 mg is about 100 tables - most of a bottle.
http://www.centrum.com/product_detail.aspx?productid=CENTRUMSLVR&panel=tablets
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