Respiratory tract infections caused by any of a large number of viruses. These can be prevented by a well-functioning immune system, but when they develop, rest and sleep are essential.
Diet:
Take lots of liquids, avoid sugar even if it comes from natural sources.
Nutrients:
Vitamin C, zinc, vitamin A but not if you are pregnant.
Herbs:
Echinacea, ginger, pau d'arco, slippery elm, ginseng.