If there is a United States Pharmacopeia (USP) symbol on the label, it means that the product does not contain lead or any other metals. However, applying for this label is voluntary so even if there is no symbol, it doesn’t necessarily mean that the supplement contains lead. Tests have also shown that even if a supplement does contain lead, the levels are still below the safety threshold. Moreover, calcium blocks lead absorption so the lead in supplements should not be dangerous.
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