I want to know the answer to the following question:
What is the Tolderable Upper intake of zinc?
All the background I'm provided with is that "However, harmful excessive supplementation is a problem among the relatively affluent, and should probably not exceed 20 mg/day in healthy people, although the U.S. National Research Council set a Tolerable Upper Intake of 40 mg/day.". Is that enough to answer the question?