Experts from Tel Aviv University have shown that common dietary supplements can help protect us against the Covid virus as well as several common winter illnesses. They include Zinc and Copper, combined with flavonoids – polyphenolic compounds found in vegetables such as pumpkins & peas.
https://www.israelnationalnews.com/news/325628 https://www.mdpi.com/1424-8247/15/3/377/htm