Dоes the herb Echinаceа help the cоmmоn cold? Reseаrchers at the University of Wisconsin-Madison published a study in the Annals of Internal Medicine that found that Echinacea was no better than a placebo. The researchers randomly assigned 142 college students who recently came down with colds to receive either Echinacea in capsule form or a placebo in capsule form. The students did not know if they were getting the herb or the placebo and took their treatment for 10 days. This is an example of