I'll have to find the study, but I remember reading somewhere that taking Vitamin D is more effective at preventing the flu, than taking the flu shot. And vitamin C (along with so many other natural treatments) are better at treating the flu than the tamiflu. Patients are not dumb like many healthcare providers think. I've been at clinical all week and alot of the patients know what the dangerous side effects of the tamiflu are. So glad to see people getting smart and looking at how "effective" drugs are.