In a recent toxicology report prepared by the U.S. National Toxicology Program on the herbal extract of Ginkgo biloba, based on rat and mice studies they said that supplementing the animals diets with Ginkgo extract could cause liver and thyroid tumors. What they fail to mention is that the extract was in a base of corn oil. Yes, corn oil that was not noted to be organic or GE (genetically engineered), but since almost all of it on the market that is not organic is GE we can expect that this is what was used. If you read my review of the research article "Long term toxicity of a Roundup herbicide and a Roundup-tolerant genetically modified maize" you will remember that GE corn causes multiple tumors in multiple organs of rats. So, it is no surprise that this product caused tumors. However, I would ask was it the Ginkgo or the corn oil that is was suspended in? There are other problems with the research but this is the most striking to me.