[Keflavik76]

mitochondria was what covid seemed to attack the most throughout the body. 

Funny. I was just talking about mitochandria. Recently had to stop drinking coffee and noticed that when I take just 250mg of Nicotinamide Mononucleotide in the morning I forget about needing coffee. 

Administration of NAD⁺ precursor, nicotinamide mononucleotide (NMN), has shown to improve mitochondrial bioenergetics, reverse age-associated physiological decline, and inhibit postischemic NAD⁺ degradation and cellular death. 

[Steve Van Doorn]

I suggest Nicene flush and allow the natural pathways to make nicotinamide. If you take nicotinamide directly you will create an excess of Nox2 which will be made into reactive oxygen species.
https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC2842161/