Risk Assessment of Essential Trace Elements: New Approaches to Setting Recommended Dietary Allowances and Safety Limits

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Abstract
By definition, every essential trace element must have a range of intakes safe from toxicity but adequate enough to meet nutrition requirements. That range is part of the total dose-response curve and its lower and upper limits are delineated on the basis of nutrition and toxicology data, respectively. Close coordination of activities to set these limits is necessary to avoid recommendations that are either impractical (narrow zones of safe and adequate intakes) or contradictory (overlapping limits, i.e., no zones of safe and adequate intakes).

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