2. The Immune System

Zinc is a popular cold remedy, right up there with vitamin C. Zinc is required for immune cell development and function. Experts recommend people stick to a tolerable upper limit of 40 mg per day.
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Zinc is a popular cold remedy, right up there with vitamin C. Zinc is required for immune cell development and function. Experts recommend people stick to a tolerable upper limit of 40 mg per day.