This is great advice. If you have a chance to get the vaccine, that's the best option. But keep wearing masks, and try to not get the virus in any ways you can. Vitamins are basically boosting your immune system, and as a bonus there are studies that back up that it actually helps in some cases 77% better outcomes (potentially more). That doesn't mean you can't die from covid even if you're taking these vitamins (as well as with the vaccine).