Zinc: Deficiency Correction, Cold Lozenges, and the Copper Problem

Summary

Zinc is a genuine deficiency-correction mineral — fix a real shortfall and immunity, taste, wound healing and (in deficient men) testosterone all recover — and a modestly real acute cold therapy at high lozenge doses; but as a daily "immune/testosterone booster" in someone who is already replete it does **nothing useful and reliably causes copper deficiency above ~40 mg/day**, which makes "take it for insurance" one of the more common self-inflicted micronutrient injuries. ---