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The UCL team tested around 70 products overall, using two methods -
nuclear magnetic resonance spectroscopy and high performance thin layer chromatography - to study their composition.

Products purchased from high street shops were generally of higher quality than those purchased from internet retailers. All those products that contained no herbal ingredient whatsoever or unidentified substances, came from internet retailers.

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Head of the UCL research team Professor Michael Heinrich said: "I think some of the suppliers of food supplements are lying. In other cases I think they don't know what they're doing. Many of the botanical drugs come from rare or increasingly rare species, so it makes perfect sense to get something cheaper…which helps to you get a better price at a lower cost."

He warned consumers that a high price tag was no guarantee of quality.
A spokesman for the Food standards Agency said: "The FSA champions the rights of consumers and misleading them in this way is unacceptable."
He said a herbal food supplement would be investigated if a complaint was made about a specific product, if members of the public were to fall ill as a result of taking these products, or if evidence of mislabelling were provided.

The results of the BBC/UCL tests have been passed on to the FSA's Food Crimes Unit.

http://www.bbc.com/news/health

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