CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY
Echinacea capsules. Medicinal herbal capsules made from the roots of the purple coneflower plant, Echinacea angustifolia. This native plant of North America was used by the indigenous population to treat burns and wounds, and to prevent infection. The leaves and roots are said to contain an immunostimulant, an agent that encourages the body's immune system to form antibodies. Many people take echinacea to help ward off colds and flu.
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