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Description
Selenium fortification of an Italian rice cultivar via foliar fertilization with sodium selenate and its effects on human serum selenium levels and on erythrocyte glutathione peroxidase activity

D.McLeodJ

J Neurosci (2015) 35:218190

Just slight changes in the level (too high or too low) can be dangerous or even life-threatening
The ascorbate cyanide test: Add the patients RBCs to the ascorbate cyanide

Ophthalmology 124 , 224234 (2017)