Also take a look at thymoquinone, which supposedly inhibits mouse coronavirus, which is very similar to SARS-coronavirus.
The effects of Nigella sativa (Ns), Anthemis hyalina (Ah) and Citrus sinensis (Cs) extracts on the replication of coronavirus and the expression of TRP genes family
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3933739/
The effects of Nigella sativa (Ns), Anthemis hyalina (Ah) and Citrus sinensis (Cs) extracts on the replication of coronavirus and the expression of TRP genes family https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3933739/
Thymoquinone is also generally protective of lung health in several models: https://www.tandfonline.com/doi/abs/10.1080/10520295.2019.16... https://www.ncbi.nlm.nih.gov/pubmed/31044379 https://www.ncbi.nlm.nih.gov/pubmed/31143688
It is found in orange peel and black seed (Nigella sativa) extract.