This document provides proposed limits with accompanying explanations as to how they were determined for lead, mercury, cadmium and arsenic, and accompanying explanations as to how these limits were determined. It also discusses relevant regulations about the presence of these chemicals in products sold in the United States, and daily limits that have been set for these by regulatory agencies, both within the United States and elsewhere. In addition, it reviews available analytical methods for measuring heavy metals, and provides guidance on how to determine which analytical methods are most suitable for dietary supplements and on how to choose a contract lab that can properly conduct heavy metal testing.
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