A further problem in enclosed spaces is the enforced breathing of recycled and potentially contaminated air. Studies by Dr. Dick suggest that good ventilation can help disperse nasty cold (and flu) viruses. The “old wives” who spun tales may have known this when they recommended opening the bedroom window at least a little while you sleep. At home or work, a forced-air ventilation system can help, if it is kept in working order. If the air is heated by radiators or an electric baseboard, consider using fans to help keep it circulating. On a plane, of course, there’s nothing you can do to cleanse the air, which makes keeping yourself well hydrated all the more important. Those who believe in the protective value of vitamin С (despite the lack of scientific evidence) might also try taking about 1,000 milligrams of vitamin С just before a plane trip and perhaps a second dose after landing.

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