Q: I take 50 mg of zinc daily. Is it OK, or, I’m taking zinc in excess? Does it cause zinc toxicity, when taken in excess?
A: You are taking too much zinc. No more than 40 mg a day is recommended. Too much zinc can be harmful. For example, taking too much zinc can increase the risk of getting prostate cancer. To learn more about zinc go to this article on the National Library of Medicine site.
The Effects of Too Much Zinc – Livestrong.com