KEY POINTS

Multiple studies have documented the beneficial role of zinc in reducing infection in respiratory and gastrointestinal (GI) infection-related morbidity and mortality in children and the elderly.
1 
Epidemiological data notwithstanding, studies on the role of selenium supplementation for preventing cancer have largely yielded disappointing results.
2 
Moderate to high doses of calcium may actually increase the risk of cardiovascular disease. Zinc
3 
Present throughout the body…