WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / 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 prevent infection. The leaves and roots are said to contain an immunostimulant, an agent that encourages the body's immune system to form antibodies.
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