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How many tablets of selenium 200 mcg are recommended per day?

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No more than one 200-microgram tablet of selenium should be taken per day, according to WebMD. Two tablets in addition to the selenium eaten in a normal diet exceeds the overdose level of more than 400 micrograms, which may result in fever, nausea, liver or heart problems, or death.

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Patients should discuss taking selenium supplements with their doctors because they may interact with other medications, including corticosteroids, antacids, birth control pills, cholesterol-lowering statin drugs and chemotherapy drugs, reports WebMD. Selenium is associated with an increased risk of squamous cell carcinoma, and one study suggests that daily consumption of 200 micrograms of selenium increases the risk of developing type 2 diabetes, although that is not confirmed as of December 2014.

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