And yes, Vitamins (Pronounced VITTA-mins, a la Malcolm McDowell in "A Clockwork Orange" "You mean like VITTAmins?") C and D, an age-appropriate multivitamin, (again, VITTA-min) plus zinc if one can find it these days... and protect oneself in general... we all know those particulars at this point.
But megadose vitamins as a treatment are being studiously ignored by the medical profession at this point.
The very best doctors of the time simply refused to believe Ignaz Semmelweis when he tried to get them to wash their hands between doing autopsies and childbirth!