This is relevant because calcium supplements are often made either from limestone (calcium carbondate) or from oyster shells, which are a waste product in the seafood industry.
About 15 years ago I had of a study that had found lead in calcium supplements. Came across a paper today that was in my read/file pile. It is a 2000 paper that found:
- Four of the seven oyster shell supplements had lead in them.This being of the approximate level of 1 µg/ supplement pill (800 µg dose). Any lead intake is unhealthy. However any level below 3 µg per 800 µg tablet.
- Four of the 14 limestone supplements had lead in them.With an average of 1.5 µg per 800 µg dose.
Lastly remember it is not just your calcium intake that builds strong bones. You MUST have a high vitamin D level as well.
Reference Edward A. Ross; Nancy J. Szabo, PhD; Ian R. Tebbett, Lead Content of Calcium Supplements JAMA. 2000;284:1425-1429. :
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