| http://www.w3.org/ns/prov#value | - Although selenium is an essential element, it is also toxic at relatively low doses.9 The tolerable upper intake level (UL) of selenium has been established at 400 ??g/d to avoid visible symptoms of selenium toxicity in sensitive persons.9 Recently, high serum selenium levels were associated with the prevalence of diabetes mellitus in the NHANES III,35 and selenium supplementation increased the ri
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