http://www.forbes.com/technology/sci...tr1366145.html
WASHINGTON, May 10 (Reuters) - "Herbal" Viagra and other so-called natural alternatives for treating impotence advertised on the Internet and in men's magazines are often contaminated with real drugs and could kill those who take them, researchers said on Monday.
They said the flood of e-mail spam touting alternatives to prescription erectile dysfunction drugs was a sign of how popular such products were, but the researchers suggested that governments monitor and regulate supplements more closely.
[...]