Covid has ZERO deaths with sufficiently high vitamin D levels(if memory serves it was something like blood levels of 80mg/L) so if you aren't taking Vitamin D start immediately(3-4000iu minimum, absorption/uptake of supplemental vit D isn't all that great so dosages reflecting recommended daily intake won't get you anywhere even close to that uptake...)

Covid has ZERO deaths with sufficiently high vitamin D levels(if memory serves it was something like blood levels of 80mg/L)