It is likely going to be found that long covid can be reversed with acute doses of Vitamin B3. Here's a few links, including a Nature article about it:
First paper was published March 2020, and only discusses B3 in the context of lung damage.
Last paper doesn't seem to address cognitive function either.
* https://www.nature.com/articles/s41418-020-0530-3
* https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7322475/
* Study: https://www.clinicaltrials.gov/ct2/show/NCT04407390
* https://www.sciencedirect.com/science/article/pii/S147149062...
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