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Zinc helps the immune system

Zinc helps regulate the immune response, including the function of “T-cells” a type of white blood cell that
defends the body against pathogens and cancers. T-cell function declines with age.

In this study, 31 adults age 65 and older, living in a care facility and deficient in zinc, took a placebo or 30 mg of zinc per day. All participants had zinc levels below 70 mcg/deciliter of blood at the start of the study. After three months, while there was no change for placebo, zinc levels had increased an average of 16 percent in the zinc group. Doctors also measured changes in T-cell function and found the number of T-cells had increased significantly in the zinc group. 

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