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Editor’s Note: This article was originally published in 2018 and is preserved for historical interest. Some recommendations, regulations, and scientific evidence have changed since it was written. It reflects the research and perspectives available at that time.

A randomized, double-blind, placebo-controlled study was published in the Clinical Nutrition (2012 Aug 31; S0261-5614(12)00185-9). The subjects were 96 children who were under the age of six. Over a period of two months they received either 10 mg of zinc gluconate or a placebo. The subjects were evaluated every two weeks over a period of six months. The group receiving the zinc had fewer respiratory infections and infections were less severe when compared to the placebo group.