Sorry. Washing hands and avoiding crowds is good policy. But face masks and vitamins are worthless.
https://www.newscientist.com/article/dn3692-face-masks-are-best-protection-against-sars/
Sorry but you’re wrong. Nothing is a panacea but the right vitamins certainly do positively boost immune systems in a way that might stave off infection to start with. And masks were important with SARS and clearly helps in some circumstances. Washing hands and avoiding crowds are very important too of course.
You completely missed my point - every little bit helps. Masks reduce SOMEWHAT the possibility of being exposed, so it is senseless NOT to use them in an environment in which it is known that a fair percentage of those around you are carrying a bad disease. As to vitamins, it is also senseless NOT to use them to boost up your immune system. I am not a believer in the “massive doses of Vitamin C will kill any disease” theory (or, more accurate, BS), but they help to some degree.