Yeah adaptogens (ginseng, eleuthero, astragalus, ashwagandha... ) help body fight among other things. If nothing else they will help mitigate stress from all this, especially ashwagandha helps with stress and sleep.
High dose vitamin C (bowel tolerance point) during infection.
Vitamin D.
Zinc.
Magnesium (i make mag oil and use transdermally), Mg boosts T cell activity ridiculously high they go Jason Bourne...
All listed things are also preventative, I do all this now because my immunity sucks and even a little draft mows me down.
People run to echinacea but echinacea helps mainly before you get sick, not too useful when it happens, so adaptogens are better to have imo because they help in both cases.
They are looking into quercetine in Canada, the trial is on but if it's successful it will sell out and then they will be reporting on tv to get it.
They are looking into what helped with MERS/SARS because this virus is highly genetically similar.
Licorice tea or extract is the best bet to have during this mess, unless there is high blood pressure (contraindicated, it can raise bp). Here's a nice recap:
https://plantmedicines.org/licorice-mers-sars/
I like the idea of licorice because unlike quinine it doesn't stop your heart, lol. No, seriously. People order quinine (cinchona bark) it was selling out all over Amazon but it can stop the heart by slowing the rhytm especially in arrhytmia. It's really not to be used at home...
I hate to be redundant but reader please dont take this as professional medical advice - everyone should check for med interactions and contraindications with their doc before taking anything and especially high dose anything...