BLONZ: I am concerned about the mineral zinc and whether it is possible to get too much. I want to know if this could be a problem.-- F.F., Scottsdale, Arizona. An informative study in the Journal of ...

All mushrooms contain zinc but shiitakes have the highest amount. A cup of cooked shiitake mushrooms contains 18% of your daily requirement. While this type of mushroom is most commonly used in ...