https://www.nccih.nih.gov/health/tips/tips-natural-products-for-the-flu-and-colds-what-does-the-science-say
5 Tips: Natural Products for the Flu and Colds: What Does the ...
Zinc is available in two forms—oral zinc (e.g., lozenges, tablets, syrup) and intranasal zinc (e.g., swabs and gels). A 2015 analysis of clinical trials found ...