Common ColdCoughInfectionTea

Green tea capsules to treat cold and flu symptoms

Researchers from the University of Florida at Gainesville report it’s a safe and effective dietary supplement to reduce your risk of cold and flu symptoms.

And there’s more.

First, the details.

  • Healthy adults were randomly assigned to take Camellia sinensis (green tea) capsules or a placebo twice a day for 3 months.
  • The volunteers kept a daily log of cold and flu symptoms including fever, runny nose, stuffy nose, sore throat, cough, headache, diarrhea, and nausea.
  • Neither the adults nor the researchers knew which treatment they were given.

And, the results.

Among subjects taking the green tea capsules?

  • 32% fewer people with symptoms
  • 23% fewer overall illnesses of at least 2 days duration
  • 36% fewer days with symptom
  • These differences were significant compared to those taking placebo.
  • Also, gamma-delta T cells from those taking the green tea extract increased 28%.
  • And they secreted 26% more gamma interferon compared to the gamma-delta T cells from the volunteers taking placebo.
  • Again, significant differences.

The bottom line?
In addition to symptom control, this product might help gamma delta T cells generate a primary immune response to certain microorganisms.

Dr. Melissa McCarty from Bastyr University in Seattle, Washington says that in addition to all the other recommendations, “you might also consider drinking a lot of green tea — or supplementing with a green tea extract, such as the one used in this study.”

12/5/07 20:47 JR

Hi, I’m JR

John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at, a complementary and alternative medicine website.