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 My dad would recommend quercetin and zinc supplements. They always made me feel kind of sick, though. 
Vitamin D. 
Our main antiviral and respiratory herb is hyssop (Hyssopus officinalis). 
 iodine nasal is supposedly the most effective. 
having your body dosed with D and zinc all the time is supposedly the most significant preventative. 
having some vitamin C powder so you can take a big dose quickly is pretty good too.