Q. Can someone that does not usually take vitamins, take them now even during Shabbos, to build resistance to the Corona virus?
A. Horav Shlomo Miller's Shlit'a opinion is that you should first consult with your doctor as to which vitamins if any are recommended for enhancing immunity. If he does advise to take some, you can take them during Shabbos also.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit'a.