Until there is a definitive treatment available for this one reasonable strategy for those at risk of being exposed to this is to take immune boosting supplements that have been documented to be safe and potentially effective against other viral causes of respiratory pneumonia.

There is no guarantee that a protective effect that helps against rhinovirus or influenza will cross over and help with coronavirus but it might and most of these supplements are safe with limited downsides.

The following are two supplements I have purchased and have on hand to take immediately if I develop any respiratory symptoms. I have also listed the studies that show these agents appear to be helpful at least with influenza. Hopefully their protective effect will cross over to coronavirus although this is unknown.


Elderberry Extract

Randomized study of the efficacy and safety of oral elderberry extract in the treatment of influenza A and B virus infections.
https://www.ncbi.nlm.nih.gov/pubmed/15080016

Elderberry Supplementation Reduces Cold Duration and Symptoms in Air-Travellers: A Randomized, Double-Blind Placebo-Controlled Clinical Trial
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4848651/

Vitamin C

The effectiveness of vitamin C in preventing and relieving the symptoms of virus-induced respiratory infections.
https://www.ncbi.nlm.nih.gov/pubmed/10543583

The relationship between vitamin C dosage and its effects on the duration of the common cold symptoms.
https://www.sciencedaily.com/releases/2017/03/170330115246.htm

What I am personally doing it taking 1,000mg of vitamin C daily and if I develop symptoms of respiratory illness I will start taking the elderberry.

^^^ Four to six grams of vitamin C, daily.