12) Treating diarrhea
According to the World Health Organization, diarrhea "kills an astonishing 1.6 million children under 5 every year. An article in TIME magazine said that "zinc pills appear to halt diarrhea in its tracks."
In addition, a PLoS Medicine study, which "followed a nationwide public health campaign to increase zinc use for childhood diarrhea in Bangladesh," confirmed that a 10-day course of zinc tablets is effective at treating diarrhea and also helps prevent future bouts of the condition.