Zinc overdose, Toxic effects of excess intake

Toxic effects of zinc are rare as excessive absorption is usually prevented by the abdominal pain, nausea and vomiting that very high doses (around 200 mg) cause. Other symptoms include dehydration, lethargy, anemia and dizziness.

Long-term use of high doses causes secondary deficiency of copper. This has been seen with intakes of zinc as low as 25 mg per day.
Zinc overdose Long-term use of doses above 150 mg have been reported to cause the suppression of immune function and decreased levels of HDL cholesterol which can lead to heart disease. Excessive use of supplements during pregnancy may be harmful to the fetus.

 

 
 
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Zinc