We seem to be heading for a big flu outbreak.
NAC has been shown to attentuate flu symptoms. [Eur Respir J. 1997 Jul;10(7):1535-41.
Attenuation of influenza-like symptomatology and improvement of cell-mediated immunity with long-term N-acetylcysteine treatment. De Flora S1, Grassi C, Carati L.]
These authors comment: “Administration of N-acetylcysteine during the winter, thus, appears to provide a significant attenuation of influenza and influenza-like episodes, especially in elderly high-risk individuals. N-acetylcysteine did not prevent A/H1N1 virus influenza infection but significantly reduced the incidence of clinically apparent disease.” The present virus is a different strain, but it should work just the same.
Vitamin D will also help. (There is some evidence that depletion of winter sunlight and the resulting low D levels promote flu outbreaks.)