I had this bookmarked but forgot about it and recently found this. Trehalose is sold as an alternative sweetener and is available without a prescription in most countries, I believe. Another food additive I use now and then is iota carrageenan which has some activity agains Covid.
Potential Fast COVID-19 Containment With Trehalose
https://www.frontiersin.org/articles...020.01623/full
When I felt really tired for some reason at times, I took combinations of things like colloidal silver, elderberry extract, vitamins C and D, zinc and quercitin, St. John's Wort, Famotidine, Strepsils with amyl meta cresol and dichlorobenzyl alcohol etc. just in case it was Covid.
http://sciliterature.50webs.com/virus.htm