Hilariously, James Watson has been sounding the bell on this for years (possibly motivated by a rivalry with Linus Pauling, who was downing megadoses of vitamin C at the end of his life).  But nobody has been listening to Watson because of the overt racism in his talks for most folks drowning out the interesting parts.  Of course, watson himself has been megadosing with metformin to stay alive longer, and claims to have prophylactically prevented prostate cancer in himself, though recently metformin has been shown to also be problematic.<p>Both of these guys have lived to quite advanced age though, so who knows anymore.