Cork, don't forget quinine, it aids in the absorption of the zinc into your cells, you can get 80mg of quinine per/liter of Schweppes tonic water, wash down that 50mg zinc tablet with about 3 ounces of Schweppes as a daily prophylactic.
Ivermectin is an age old cheap, safe, drug that is proven as a cure if you already have contracted the virus, 6mg first day and another 6mg 3 days later.
Both of these were discredited and banned for use saying they were unsafe, but 60 years of use and 100's of millions of doses around the globe say otherwise. They cost pennies, so there is no money in it for big pharma...go figure.