Who’s tired of hearing about the remarkable ability of echinacea to stave off colds? Now, from researchers at the University of Wisconsin, comes a definitive review of 24 randomized controlled trials involving 4631 participants and 33 preparations all in an effort to determine whether echinacea was a safe and effective cold prevention and treatment. And the answer is….maybe a little. Science Daily reports that the researchers found that “at least some Echinacea preparations may reduce the relative risk of catching a cold by 10 to 20 percent, a small effect of unclear clinical significance.”