Science Forums 2

[TeleMad]

I quickly found these warnings, and note that these are sites trying to sell you their supplements.

Zinc in amounts greater than 200 mg a day can cause nausea, vomiting, and diarrhea. Taking even 100 mg a day in supplement form over long periods can result in problems, including lowered levels of HDL ("good") cholesterol and diminished immune-system function.

An association between excessive zinc and Alzheimer's disease has been made but requires further investigation. (http://www.wholehealthmd.com/refshel...,10071,00.html)

Intake of zinc should be kept to under 100 mg per day as larger amounts may result in nausea, diarrhea, dizziness, drowsiness and hallucinations.
(http://www.anyvitamins.com/zinc-info.htm)

So I guess the best advice is not to take megadoses of zinc like some people do with other vitamins and nutrients.