Analysis of zinc studies shows inconclusive evidence on preventing or shortening common cold duration; zinc may reduce symptoms by up to two days.

A recent analysis of studies on zinc and cold viruses shows inconclusive evidence on whether over-the-counter zinc treatments can prevent the common cold or shorten its duration. While zinc is essential for immune function and wound healing, the research available together indicates that zinc products may reduce cold symptoms by up to two days, but more research is needed.