...i have no comment on vit C for any claims made...just don't know! i will say, as a former microbiologist, that i've been sick (flu/cold/virus) only a couple of times over 45 adult yrs. it's not complicated....wash your hands frequently (at least thoroughly once/dy), DON'T touch your face, if you touch public elements (door handles, elevator buttons, railings, etc) sanitize your hands, avoid as much as possible obviously ill folks, be aware public gatherings in enclosed spaces require diligence to above (go, enjoy, just take precautions), cover YOUR mouth/nose when someone sneezes, refrigerate foods before 2 hrs exposure to room temp ( thats a food safety deal). i'll stop now...no need for paranoia...just remember: wash/sanitize hands, don't touch yur face....