Edited sentence: For instance herbs like eleuthero (Siberian ginseng) are described as ginseng, a totally different species.For instance, St.Ginkgo biloba was used in Chinese medicine for respiratory illnesses using the nut, but evidence-based uses refer to its qualities as a memory enhancer or blood thinner.Given the lack of patent protection for very expensive testing, it is unlikely that common uses of easily accessed herbs will have significant double-blind placebo-controlled testing in the foreseeable future.Herbal studies frequently also have incorrect botanical identifications, small sample sizes and short term frameworks.In view of the lack of studies, the conclusions of a recent Mayo Clinic study that 2/3 of adults who took common herbs (except echinacea and ginseng) for reasons other than those shown by double-blind placebo-controlled studies is surprising.John's wort has been used since the time of Hippocrates as a vulnurary and especially for nerve pain, but the evidence based research only covers the more recent uses as an anti-depressant.One problem with relying only upon evidence based research is that few herbs have been studied, many studied are for novel uses and the research is frequently of poor quality, done without assaying the product to ensure the proper identification or concentration, and frequently with dosage levels that are below those commonly used by professional herbalists.Recent studies of echinacea  used either unusual forms (the juice, or the root of Echinacea purpurea) and a dosage that is a third of the traditional dosage.The quality of double-blind testing has problems as well