At the change of seasons to build immunity

Echinacea-containing herbal preparations have become increasingly popular over the past two to three decades as being capable of modifying or regulating one or more immune functions. Echinacea products are currently one of the best-selling herbal preparations in the United States.

The results of many clinical trials strongly suggest that echinacea-containing products improve symptoms and shorten the duration of colds and upper respiratory infections though not all trials have turned out positive for some types of products. However, reports have been made that suggest that some studies use too low of a dosage for effectiveness.