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[Morris Luo]

A friend told me that there are no true natual resveratrol 98% in China, all the products on the market is synthetic or mixed as natural. So anyone knows how to distinguish synthetic resveratrol, giant knotweed resveratrol and mixed "natural"resveratrol(including synthetic and gian knotweed)?

[maxwatt]

It could possibly be done by chromatographic determination of the type and distribution of impurities in the sample. But I am not aware of anyone having researched this method. I am told early samples of 'synthetic' (actually produced by genetically modified bacteria) showed a high, as much as 10 percent. presence of unknown impurities, which were not identified (according to Anthony, who paid for tests.)

It should be possible for a lab that has samples of known synthetic, and known plant extract, to determine this by HPLC analysis. But I know of no one doing this.