CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY
Chopped ephedra (ephedra sinicea). Ephedra has been used in traditional Chinese medicine for 5,000 years to treat asthma, hay fever and colds. In recent years the safety of ephedra-containing dietary supplements has been questioned in the US.
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