One of the challenges healthcare workers face when treating this is the high personal risk of infection.

Hopefully hydroxycloroquine or one of the other drugs being looked at will be a game changer but until that is certain anyone dealing with this disease on a daily basis may want to consider taking some of the general immune boosting supplements. Some of these have randomized trial indicating they are helpful with influenza.

It should be emphasized that there are no guarantees that agents that help with influenza will help at all with coronavirus. However, since these supplements are considered generally safe they are worth worth looking at.

The following are the two supplements I have purchased and have on hand to take immediately if I develop any flu symptoms. I have also listed the studies that show these agents appear to be helpful with influenza.

Hopefully their protective effect will cross over to coronavirus although this is currently unknown.

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 may extend to 6-8 grams per day.
https://www.sciencedaily.com/releases/2017/03/170330115246.htm

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/