In an article entitled "Preventing and Treating Winter Colds" published by The Herb Companion, green tea was listed as an herbal and natural approach to preventing colds.
From The Herb Companion:
"Green tea (Camellia sinensis). University of Florida researchers gave healthy adults either a placebo or green tea capsules twice a day. Three months later, the tea group reported significantly fewer colds.
No other herbs have been shown to prevent colds. However, several boost immune function against viruses, so it’s a good bet they help prevent colds."
That's great news for us, we love our green tea!