Since Nigella sativa, Ivermectin and Pfizermectin are all protease inhibitors, I have taken it upon myself to start up this big fat list of every protease inhibitor I can find, and look for any studies on any of them for use to treat C19 or respiratory viruses, in general.
I was pleased to find out that Ginkgo leaf, which I drink in tea regularly, not only has quercetin, which I knew about, but another, less known protease inhibitor called rutin, as well.
Let's begin:
The study:
https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC7985176/
The plants:
Torreya nucifera - A Japan / Korean native plant with a long history of use in food and other purposes like making vegetable oil.
Isatis tinctoria - Also used for centuries as an herbal medicine. Also used in blue dyes, oddly enough, but is still usable as traditional medicine.
Rheum palmatum AKA Chinese rhubarb - edible, with a long history use in traditional medicine.
Psoralea corylifolia - Another plant with a long history of use in traditional medicine.
The study:
https://pubmed.ncbi.nlm.nih.gov/22465253/ (Not for coronavirus, but still demonstrated efficacy in inhibiting viral activity.)
Fisetin - Compound found in many fruits and vegetables, including strawberries.
Rutin - Compound found in many fruits, vegetables, and other common edible herbs. This includes buckwheat, eucalyptus, elder flowers (also high in zinc!), and ginkgo leaf (also contains quercetin!).
And guess what? Rutin and fisetin supplements are available over the counter! Talk to your doctor to make sure it won't conflict with any other medications you take, or pre-existing conditions, and think about throwing that in with your daily Z-Stack!
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If you live in California there are Eucalyptus trees everywhere. They practically grow here like weeds because of those goddamn Australians (just kidding Aussies, we love you).
Elder flowers are apparently easy to grow too.
There are elderberry plants all over Michigan. Did a job this fall and we all came home with purple stains all over us because of the abundance of these plants on the job site.
I grow them on my fence line in the back 40. Wife makes jams and iced drinks and I make wine from them.
Here you go. And you can make wine from the berries. The berries are used as a supplement too for colds or flu.
https://www.starkbros.com/products/berry-plants/elderberry-plants
No eucalyptus trees here. They wouldn't survive the winters.