Herbal food supplement labels 'can be misleading' - BBC News:
"Some herbal food supplements do not contain what they claim on the label, a study has found.
The BBC health series 'Trust Me, I'm a Doctor' teamed up with experts from University College London to test a selection of products bought from high street shops or online retailers.
Of 30 ginkgo products tested, eight contained little or no ginkgo extract.
In one case of milk thistle, unidentified substances were present in place of milk thistle.
All the evening primrose products performed well.
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."
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