My wife is treating all cold symptons in the family with a few spoons of freshly ground ginger juice mixed with honey.
While I don't mind an occasional placebo, drinking ginger juice is unpleasant because of the burning sensation while swallowing, especially with an inflamed throat.
Immune Boosting Action
Ginger can not only be warming on a cold day, but can help promote healthy sweating, which is often helpful during colds and flus. A good sweat may do a lot more than simply assist detoxification. German researchers have recently found that sweat contains a potent germ-fighting agent that may help fight off infections. Investigators have isolated the gene responsible for the compound and the protein it produces, which they have named dermicidin. Dermicidin is manufactured in the body's sweat glands, secreted into the sweat, and transported to the skin's surface where it provides protection against invading microorganisms, including bacteria such as E. coli and Staphylococcus aureus (a common cause of skin infections), and fungi, including Candida albicans.
I'm not convinced. Is there any solid evidence that ginger works against the common cold?
I also found an article called "Fresh ginger (Zingiber officinale) has anti-viral activity against human respiratory syncytial virus in human respiratory tract cell lines" in the Journal of Ethnopharmacology, but I am not sure how to interpret the results.