A member asked:

Which calcium supplement may contain lead and other toxic metals?

A doctor has provided 1 answer

Shell-based calcium: Calcium preparations that are prepared from seashells and oyster shells may contain toxic components, such as mercury, cadmium, and lead. Please check the USP mark on a supplement indicates that it meets governmental standards for purity and quality.

Answered 1/15/2015

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Will taking supplemental calcium lead to more kidney stones?

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