I posted this higher up but..
Teres no reason to believe ivermectin does help. Firstly the study that Ivermectin-for-covid is based on in vitro(cell-in-petri-dish) studies of rhesus monkey liver cells[1]. Additionally. Rhesus monkeys have differing bodies sizes and in order to get an equivalent dose in humans would require overdosing on ivermectin, which can and has lead to death. Ivermectin targets the host nuclear transport importin α/β1 heterodimer in host tissue, exerting effects directly on cells of the human body.[2]
1- https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC7129059/
2- http://dicyt.uto.edu.bo/observatorio/wp-content/uploads/2020...
As for vitamin D. That's an interesting one. Vitamin D isn't only correlated with better covid-19 outcomes, it's associated with better cancer outcomes, as well as flu outcomes. It's also associated with better outcomes in HIV, malaria, and car crashes. It's associated with a lower ALL cause mortality[A]. Impressive stuff. Now either it's the fountain of youth, or as they like to say in the sciences this is a case of "correlation does not equal causation". Now it probably won't hurt to take, but there's more to it than that. Considering about 42% of Americans are deficient in vitamin D[B] it's not a bad idea to supplement, but that also points to another correlation-- the portion on the population that has sufficient vitamin d levels either goes out often enough to synthesize it naturally, or simply is the type to go out of their way and supplement it. So two groups that will have greater physical health than the average person. This could explain why people with sufficient vitamin D do better than with covid than the average person
[A] https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC4103214/
[B] https://pubmed.ncbi.nlm.nih.gov/21310306/