Overdoing zinc can cause copper deficiency warns expert

“Zinc supplementation can decrease the intestinal absorption of calcium under conditions where there is not adequate calcium (low calcium) in the diet,” Mr Batt added.

“Calcium deficiency is mostly related to poor bone mineral density, as well as fatigue and muscle cramps and weakness.”

One paper, published in the Journal of the American College of Nutrition, says: “The study has shown that, during zinc supplementation, the intestinal absorption of calcium was significantly lower during a low calcium intake than in the control study, 39.3 percent vs 61 percent respectively.”

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