What are the effects of taking too much zinc?

Dr. Michael Roizen, MD
Internal Medicine
Although zinc deficiencies may cause various problems, boosting zinc beyond basic levels appears to do no good and may even cause harm. For example, too much zinc may interfere with the workings of another trace mineral you need, copper. As with most minerals, high intake may prove toxic, and too much zinc can damage the immune system. Take no more than 30 milligrams (mg) daily. (If you take 6 of the zinc cough drops -- the recommended max per day -- that's 80 mg).

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.