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The biological availability of selenium from sodium selenite and selenomethionine for glutathione peroxidase activity was studied. Rats were fed ad libitum for 2 weeks a basal diet deficient in both selenium and vitamin B6, and then for the subsequent 2 weeks the same diet supplemented with vitamin B6 (2.5 micrograms as pyridoxine-HCl/g diet) or selenium (2 microgram/g diet) or both. In the presence of vitamin B6, selenite and selenomethionine increased equally the glutathione peroxidase activity in both the liver and erythrocytes above that of selenium-unsupplemented controls. In the absence of vitamin B6, selenomethionine was less effective in the liver and ineffective in the erythrocytes while selenite was equally effective in both tissues and was as effective as in the presence of vitamin B6. These results indicate that selenite selenium is readily available for glutathione peroxidase induction as compared with selenomethionine, and establish that vitamin B6 is involved in the metabolism of selenomethionine to supply selenium for glutathione peroxidase.
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