MADISON, Wis. — An over-the-counter herbal supplement believed to improve immunity function has minimal impact in relieving the common cold, according to research by the University of Wisconsin-Madison School of Medicine and Public Health released Monday.
The study, published in this month's Annals of Internal Medicine, found that echinacea reduced the duration of the cold by seven to 10 hours. Bruce Barrett, lead researcher and associated professor of family medicine suggested that was not considered a significant decrease.