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Selenium (Se) is a part of the enzyme glutathione peroxidase, which metabolizes hydroperoxides formed from polyunsaturated fatty acids. Selenium is also a part of the enzymes that deiodinate thyroid hormones. Generally, selenium
Plasma levels of selenium vary from 8 to 25 mcg/dL (0.1 to 0.3 micromoles/L), depending on selenium intake.
At high doses (> 900 mcg/day), selenium causes toxicity.
Symptoms of selenium
Toxic levels of plasma selenium are not well defined.
Diagnosis of selenium toxicity is usually clinical. Blood or urinary selenium levels can be measured.
Treatment of selenium
(See also Overview of Mineral Deficiency and Toxicity.)
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