D takes months to build up to a therapeutic level.
Maybe but I bet the body would use every bit it can get, especially if it’s under attack by COVID.
are you saying it’s useless to try because the medical or scientific belief is it can take months? medicine and science have been proven very wrong many times in the past because results didn’t fit their agenda/evolution/scholarly “knowledge”.
IMO best to do all the good things possible and leave all else to God.