But, as with other metals, ingesting too much can cause side effects such as vomiting, cramps and diarrhea. These symptoms, however, will subside once you stop taking it. You don't have to have one of thesefoods in every meal, every day. Some days you'll have plenty - cereal, a peanut butter sandwich and a hamburger. Other days you'll have less.
Deficiencies are rare.
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