Vitamin C is generally considered to be an important "nutrient," but its perceived value usually ends there. Only rarely does the public (and the medical profession) glimpse its true potential in the prevention and treatment of disease -- and this because, by legal definition (in the US), only FDA-approved drugs can prevent, treat and cure disease.
This does not mean, however, that essential nutrients like Vitamin C cannot in fact prevent and treat disease, i.e. only because it is illegal to speak truthfully about something, doesn't mean that that something isn't true. The National Library of Medicine, in fact, contains thousands of studies demonstrating vitamin C's ability to significantly improve health, with 220 disease applications documented on the research site GreenMedInfo.com alone. The best thing 'we the people' can do, despite our lack of medical degrees and licensure, and without the FDA's iron-fisted legal and regulatory apparatus on our side, is to use the peer-reviewed research at our disposal to inform and protect our treatment decisions.