Brian Cady wrote:
Some protease inhibitors Webpage may help slow SARS-CoV2 spread, since the virus depends on a human host serine protease present on susceptible cell walls to prepare to enter each cell. TMPRSS2 is a name for this serine protease.
One such inhibitor suggested, bromhexine,
comesis derived from a compound from Justicia adhatoda, also known as Webpage Adhatoda vesica . This plant is related to Justicia americanaWebpage, which itself is hardy to zone 4, unlike much of the rest of the genus. It ranges into Missouri nativelyWebpage.
I have no idea whether American water-willow helps prevent COVID-19, though.