Introduction

This fact sheet provides basic information about the herb echinacea--common names, uses, potential side effects, and resources for more information. There are nine known species of echinacea, all of which are native to the United States and southern Canada. The most commonly used, Echinacea purpurea, is believed to be the most potent.

Common Names--echinacea, purple coneflower, coneflower, American coneflower

Latin Names--Echinacea purpurea, Echinacea angustifolia, Echinacea pallida

What It Is Used For

• Echinacea has traditionally been used to treat or prevent colds, flu, and other infections.
• Echinacea is believed to stimulate the immune system to help fight infections.
• Less commonly, echinacea has been used for wounds and skin problems, such as acne or boils.

How It Is Used

The aboveground parts of the plant and roots of echinacea are used fresh or dried to make teas, squeezed (expressed) juice, extracts, or preparations for external use.

What the Science Says

• Studies indicate that echinacea does not appear to prevent colds or other infections.
• Studies to date have not proven that echinacea shortens the course of colds or flu. For example, two NCCAM-funded studies did not find a benefit from echinacea, either as Echinacea purpurea fresh-pressed juice for treating colds in children, or as an unrefined mixture of Echinacea angustifolia root and Echinacea purpurea root and herb in adults. Other studies have shown that echinacea may be beneficial in treating upper respiratory infections.
• NCCAM is continuing to support the study of echinacea for the treatment of upper respiratory infections.