NIH is pretty much the gold standard when it comes to medical research and they can't seem to find any evidence that Ivermectin makes a difference. That doesn't mean that it doesn't exist or that it doesn't make a difference, but there's no valid, credible evidence out there right now that suggests that it does. There is another report out there claiming Ivermectin makes a positive difference, but when you look at where they've accumulated their evidence from, it's mostly studies run in a bunch of third world countries using questionable research practices, which the NIH points out in their advisory.
Based on the current very low- to low-certainty evidence, we are uncertain about the efficacy and safety of ivermectin used to treat or prevent COVID-19. The completed studies are small and few are considered high quality. Several studies are underway that may produce clearer answers in review...
pubmed.ncbi.nlm.nih.gov
"OMG, NIH is a government agency, this is all a liberal led conspiracy, of course they say Ivermectin doesn't work!"