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Is too much zinc and magnesium bad for you? 

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The effect of high dietary magnesium on zinc metabolism appears to be systemic in tissues.
These findings suggest that enhanced dietary Mg intake during Cd exposure can have at least partly beneficial effect on Cd-induced alterations in homeostasis of zinc, copper, and magnesium.
The physiologic significance of magnesium and zinc is somewhat different than sodium, potassium, and perhaps even calcium, and lies in
Differences in study designs, however, limit conclusions about recommendations for intakes of magnesium and zinc needed for optimal performance and function.

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