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" ... "There were apparently no controls in the tests, e.g., microscopy for herbal powders, as well as validated chemical methods. All the herbs have been monographed in official pharmacopeias and validated analytical methods are available. At the very least these methods should have been used as a control, especially if the possibility exists that some of the preparations might be extracts, especially ginkgo and possibly SJW [St. John's wort], where DNA methods are usually unable to detect DNA, which is usually not transferred from the biomass into the extract." ... "