The recommended dietary allowance, or RDA, of selenium is 55 micrograms per day for adult men and women and children aged 4 years and older. Pregnant women and those who are breastfeeding need an additional 60 to 70 micrograms per day. The tolerable upper intake level, or UL, is the maximum daily amount of a vitamin or mineral within current safety parameters. Selenium's UL is 400 micrograms for adults.

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