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The DRI report also established a Tolerable Upper Intake Level (UL) for selenium intake of 400 mcg. This UL is for all selenium intake from foods and supplements and it is established as an amount not be exceeded on any routine basis. The Daily Value (DV) for selenium intake is 70 mcg per day.
Selenium also boosted an important gauge of the lambs' immune systems. Levels of immunoglobulin G, a protein that defends against pathogens and is essential for lamb survival, were elevated by 48 percent in Polypay ewes and 23 percent in all ewes given five times maximum FDA-permitted levels of selenium. challenge is that the range between selenium deficiency and selenium toxicity can be narrow; current FDA regulations limit the amount of dietary selenium supplementation for animals grazing on selenium-scare soils â up to 0.7 mg per sheep per day or 3 mg per beef cattle per day.