Artemisia annua is a plant native to various areas of Africa. The active ingredient is artemisinin, whose antiviral effects have been studied and proven to have inhibitory activity against various viruses’ replication.
Little is known about its effects or mechanism of action. Madagascar has experimented with the use of the plant against COVID-19. As of writing, Madagascar has reported no deaths, so there may be something to it, but its degree of effectiveness, safety or contraindications are largely unknown.
UPDATE, 5-17-20: The drug appears to function similarly to ivermectin! This may be moved to the Cures column with more investigation. With the WHO trying to bribe Madagascar to poison their supply, and the NY Daily News running disinformation about it, I think it’s safe to say that Artemisia Annua, or its active ingredient(s), are curative, or at the very least an effective treatment.
UPDATE 5-21-20: Boy, the WHO sure moves fast. Madagascar wouldn’t poison their cure for $20m, but they sure will shut up about it. I wonder how much that cost.