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 From this article:

Herbal Supplements Are Often Not What They Seem
http://www.nytimes.com/2013/11/05/science/herbal-supplements-are-often-not-what-they-seem.html

"Canadian researchers tested 44 bottles of 
popular supplements sold by 12 companies. They 
found that many were not what they claimed to be, 
and that pills labeled as popular herbs were 
often diluted — or replaced entirely — by cheap 
fillers like soybean, wheat and rice."

"For the study, the researchers selected popular 
medicinal herbs, and then randomly bought 
different brands of those products from stores 
and outlets in Canada and the United States. To 
avoid singling out any company, they did not disclose any product names."

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