How to Stay Healthy If You're Traveling During Cold and Flu Season
Briefly

Getting your flu vaccine before your trip is vital... it could reduce your risk of having to make a flu-related doctor's visit by 40% to 60%.
Starting supplements right as you're about to travel probably won't do much... for maximum effect, she suggests starting them at least a month before you leave.
It’s common to feel sniffly or achy after a trip... there are several things doctors say you can do to increase your odds of staying healthy.
To give your body enough time to build immunity... you should get your shot at least two weeks before departure.
Read at Conde Nast Traveler
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