John Day, MD, has posted extensive advice regarding over-the-counter therapies for covid-19. Some of them are prophylactic (you take them BEFORE you get sick), and some you take once you get sick to reduce the excessive inflammation that could otherwise kill you. It's similar to recommendations found elsewhere, but more complete.
I'd like to cross-post it in its entirety, but no immediate contact information to ask permission. So instead, I'll post this link for now, then consolidate the information into the supplement stack already published on the wiki.